## Introduction to STN Units System

The STN Units system was developed to support the expression of Units information for search and retrieval within STN.

The STN Units system is organized in a set of tables, corresponding to Unit Types. Within each Unit Type, the supported Units are listed. For example, the table for Unit Type = Length contains various supported length units supported by STN, such as meter, angstrom, and fathom. Where appropriate, conversion factors between the STN Units system and the SI units system are included for each supported unit.

The STN Units system may also be used to express Units information within the Z39.50 protocol. Read more about Using STN Units within Z39.50 below.

**Table of Conversion Factors**

- Conversion factors are taken from "Quantities, Units and Symbols in Physical Chemistry (IUPAC, 1988), "Conversion Tables of Units for Science & Engineering (Ari L. Horvath, Elsevier, 1986), and "CRC Handbook of Chemistry and Physics" or are calculated directly from these publications. In most cases, unit symbols are taken from the recommendations in ISO 2955- 1974 (E). For units that did not appear in this publication, symbols were taken from the IUPAC publication cited above.
- Both abbreviations and the entire unit name may be used, except for multi-word units. Since spaces are not allowed in the unit symbols, multi-word unit terms do not make a lot of sense, and thus are only represented by abbreviations.
- The units conversion procedure will remove a terminal "s" from a unit designation if no designation with the appended "s" can be found. Thus plurals of unit designations need to be added to the conversion table only in those cases where the plural form is not created merely by adding an "s" to the singular form.

**Using STN Units within Z39.50**

**Within the Z39.50 protocol, units of measure are expressed using the following ASN.1 definition for Unit and IntUnit:**

```
Unit ::= SEQUENCE{
unitSystem [1] InternationalString OPTIONAL,
unitType [2] StringOrNumeric OPTIONAL,
unit [3] StringOrNumeric OPTIONAL,
scaleFactor [4] IMPLICIT INTEGER OPTIONAL}
```

**IntUnit is simply an integer value together with a unit, and is defined as:**

```
IntUnit ::= SEQUENCE{
value [1] IMPLICIT INTEGER,
unitUsed [2] IMPLICIT Unit}
```

**In the above definition:**

```
Unit System provides the context for the unit type and unit.
Systems in common use in the scientific and technical communities
include SI, MKS, CGS, FPS, ENG, and STN. In addition to existing
standard unit systems, the unit system 'z3950' will be used to
register those unit types/units needed by implementors and not
defined by other known systems. Values of unit type and unit under
the system 'z3950'will be maintained by the Z39.50 Maintenance
Agency.
Unit Type is, for example, 'Mass'.
Unit is, for example, 'Kilograms' (when unit type is 'Mass').
Scale Factor is an integer scale factor, base 10. For example, 9
would mean that the actual value is the given value times 10 to the
9th power.
```

**When using STN Units within Z39.50, the following conventions will be followed:**

```
unitSystem = "STN"
unitType = STN Unit Type (eg, "length")
unit = STN unit (eg, "meter")
```

For further information on the Z39.50 standard, see the Z39.50 Maintenance Agency Home Page.

## Unit Multipliers

Decimal multipliers for unit symbols are taken from the recommendations in ISO 2955-174 (E) and are listed below. Both the abbreviation and the complete name may be used. Decimal multipliers may be used with any unit symbol except for the symbols for temperature. Combinations of decimal multipliers and unit symbols that eliminate one or more of the vowels of each when combined are listed in the conversion table, e.g., micro + ohm = microhm.

Multiplier Symbol | Factor by which the unit is multiplied |
---|---|

t; tera | 1E+12 = 10^12 |

g; giga | 1E+09 = 10^9 |

ma; mega | 1E+06 = 10^6 |

k; kilo | 1E+03 = 10^3 |

h; hecto | 1E+02 = 10^2 |

da; deca | 1E+01 = 10 |

d; deci | 1E-01 = 10^-1 |

c; centi | 1E-02 = 10^-2 |

m; milli | 1E-03 = 10^-3 |

u; micro | 1E-06 = 10^-6 |

n; nano | 1E-09 = 10^-9 |

p; pico | 1E-12 = 10^-12 |

f; femto | 1E-15 = 10^-15 |

a; atto | 1E-18 = 10^-18 |

## Units table

- In the following table, unit symbols are often followed by the complete name of the unit in parentheses. The text in parentheses is not part of the abbreviation.
- # after a conversion factor denotes a value that is accurate to +-5 in the rightmost digit.
- (CRC) after a conversion factor denotes a value taken from the CRC Handbook of Chemistry and Physics.

## Acceleration

Unit = m/s^2

Corresponding SI Dimension = m/s^2

Unit to SI Dimension Factor = 1

Unit = Gal (galileo)

Corresponding SI Dimension = m/s^2

Unit to SI Dimension Factor = 1E-02

Unit = galileo

Corresponding SI Dimension = m/s^2

Unit to SI Dimension Factor = 1E-02

Unit = g (standard acceleration of free fall)

Corresponding SI Dimension = m/s^2

Unit to SI Dimension Factor = 9.80665

Unit = mph/s

Corresponding SI Dimension = m/s^2

Unit to SI Dimension Factor = 0.447037222

Unit = mph/sec

Corresponding SI Dimension = m/s^2

Unit to SI Dimension Factor = 0.447037222

Unit = mphps

Corresponding SI Dimension = m/s^2

Unit to SI Dimension Factor = 0.447037222

## Amount of substance

Unit = mol (mole)

Corresponding SI Dimension = mol

Unit to SI Dimension Factor = 1

Unit = val (valar mass)

Corresponding SI Dimension = val

Unit to SI Dimension Factor = 1

Unit = mole

Corresponding SI Dimension = mol

Unit to SI Dimension Factor = 1

Unit = gmole

Corresponding SI Dimension = mol

Unit to SI Dimension Factor = 1

Unit = grammole

Corresponding SI Dimension = mol

Unit to SI Dimension Factor = 1

Unit = poundmole

Corresponding SI Dimension = mol

Unit to SI Dimension Factor = 453.59237

Unit = lbmol

Corresponding SI Dimension = mol

Unit to SI Dimension Factor = 453.59237

Unit = lbmole

Corresponding SI Dimension = mol

Unit to SI Dimension Factor = 453.59237

Unit = molfrac

Corresponding SI Dimension = molfrac

Unit to SI Dimension Factor = 1

Unit = molefrac

Corresponding SI Dimension = molfrac

Unit to SI Dimension Factor = 1

## Area

Unit = m^2

Corresponding SI Dimension = m^2

Unit to SI Dimension Factor = 1

Unit = b (barn)

Corresponding SI Dimension = m^2

Unit to SI Dimension Factor = 1E-28

Unit = acre

Corresponding SI Dimension = m^2

Unit to SI Dimension Factor = 4.04686E+03

Unit = ha (hectare)

Corresponding SI Dimension = m^2

Unit to SI Dimension Factor = 1E+4

Unit = barn

Corresponding SI Dimension = m^2

Unit to SI Dimension Factor = 1E-28

Unit = a (are)

Corresponding SI Dimension = m^2

Unit to SI Dimension Factor = 1E+02

Unit = are

Corresponding SI Dimension = m^2

Unit to SI Dimension Factor = 1E+02

Unit = hectare

Corresponding SI Dimension = m^2

Unit to SI Dimension Factor = 1E+04

Unit = cirmil (circular mil = area of a circle 1 mil in diameter)

Corresponding SI Dimension = m^2

Unit to SI Dimension Factor = 5.0670748E-10 (CRC)

Unit = cirin (circular inch = area of a circle 1 in in diameter)

Corresponding SI Dimension = m^2

Unit to SI Dimension Factor = 5.0670748E-04 (CRC)

## Computer terminology

Unit = bit

Corresponding SI Dimension = bit

Unit to SI Dimension Factor = 1

Unit = byte

Corresponding SI Dimension = byte

Unit to SI Dimension Factor = 1

Unit = kbyte

Corresponding SI Dimension = byte

Unit to SI Dimension Factor = 1024

Unit = kb

Corresponding SI Dimension = byte

Unit to SI Dimension Factor = 1024

Unit = kilobyte

Corresponding SI Dimension = byte

Unit to SI Dimension Factor = 1024

Unit = Mbyte

Corresponding SI Dimension = byte

Unit to SI Dimension Factor = 1048576

Unit = Mb

Corresponding SI Dimension = byte

Unit to SI Dimension Factor = 1048576

Unit = megabyte

Corresponding SI Dimension = byte

Unit to SI Dimension Factor = 1048576

Unit = Gbyte

Corresponding SI Dimension = byte

Unit to SI Dimension Factor = 1073741824

Unit = Gb

Corresponding SI Dimension = byte

Unit to SI Dimension Factor = 1073741824

Unit = gigabyte

Corresponding SI Dimension = byte

Unit to SI Dimension Factor = 1073741824

Unit = ips

Corresponding SI Dimension = ips

Unit to SI Dimension Factor = 1

Unit = i (instructions)

Unit to SI Dimension Factor = 1

Unit = instructions

Corresponding SI Dimension = i

Unit to SI Dimension Factor = 1

Unit = flops

Corresponding SI Dimension = flops

Unit to SI Dimension Factor = 1

Unit = flo (floating point operations)

Corresponding SI Dimension = flo

Unit to SI Dimension Factor = 1

Unit = pixel

Corresponding SI Dimension = pixel

Unit to SI Dimension Factor = 1

Unit = cps (characters/second)

Corresponding SI Dimension = cps

Unit to SI Dimension Factor = 1

Unit = c (characters)

Corresponding SI Dimension = c

Unit to SI Dimension Factor = 1

Unit = characters

Corresponding SI Dimension = c

Unit to SI Dimension Factor = 1

## Dynamic viscosity

Unit = Pa*s

Corresponding SI Dimension = Pa*s

Unit to SI Dimension Factor = 1

Unit = kg/m*s

Corresponding SI Dimension = Pa*s

Unit to SI Dimension Factor = 1

Unit = P (poise)

Corresponding SI Dimension = Pa*s

Unit to SI Dimension Factor = 1E-01

Unit = Ps (poise)

Corresponding SI Dimension = Pa*s

Unit to SI Dimension Factor = 1E-01

Unit = poise

Corresponding SI Dimension = Pa*s

Unit to SI Dimension Factor = 1E-01

Unit = micropoise

Corresponding SI Dimension = Pa*s

Unit to SI Dimension Factor = 1E-07

## Electric capacitance

Unit = F (farad)

Corresponding SI Dimension = F

Unit to SI Dimension Factor = 1

Unit = farad

Corresponding SI Dimension = F

Unit to SI Dimension Factor = 1

Unit = abF (abfarad)

Corresponding SI Dimension = F

Unit to SI Dimension Factor = 1E+09

Unit = abfarad

Corresponding SI Dimension = F

Unit to SI Dimension Factor = 1E+09

Unit to SI Dimension Scaling Factor =

Unit = statF (statfarad)

Corresponding SI Dimension = F

Unit to SI Dimension Factor = 1.112646E-12

Unit = statfarad

Corresponding SI Dimension = F

Unit to SI Dimension Factor = 1.112646E-12

Unit = s^4*A^2/m^2*kg

Corresponding SI Dimension = F

Unit to SI Dimension Factor = 1

## Electric charge

Unit = C (coulomb)

Corresponding SI Dimension = C

Unit to SI Dimension Factor = 1

Unit = coulomb

Corresponding SI Dimension = C

Unit to SI Dimension Factor = 1

Unit = statC (statcoulomb)

Corresponding SI Dimension = C

Unit to SI Dimension Factor = 3.335635E-10

Unit = statcoulomb

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 3.335635E-10

Unit = abC (abcoulomb)

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 1E+01

Unit = abcoulomb

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 1E+01

Unit = Fr (franklin)

Corresponding SI Dimension = C

Unit to SI Dimension Factor = 3.335635E-10

Unit = franklin

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 3.335635E-10

Unit = A*s

Corresponding SI Dimension = C

Unit to SI Dimension Factor = 1

## Electric conductance

Unit = S (siemens)

Corresponding SI Dimension = S

Unit to SI Dimension Factor = 1

Unit = siemens

Corresponding SI Dimension = S

Unit to SI Dimension Factor = 1

Unit = statS (statsiemens)

Corresponding SI Dimension = S

Unit to SI Dimension Factor = 1.112646E-12

Unit = statsiemens

Corresponding SI Dimension = S

Unit to SI Dimension Factor = 1.112646E-12

Unit = abS (absiemens)

Corresponding SI Dimension = S

Unit to SI Dimension Factor = 1E+09

Unit = absiemens

Corresponding SI Dimension = S

Unit to SI Dimension Factor = 1E+09

Unit = s**3*A**2/m**2*kg

Corresponding SI Dimension = F

Unit to SI Dimension Factor = 1

Unit = ohm**-1

Corresponding SI Dimension = S

Unit to SI Dimension Factor = 1

Unit = mho

Corresponding SI Dimension = S

Unit to SI Dimension Factor = 1

Unit = statmho

Corresponding SI Dimension = S

Unit to SI Dimension Factor = 1.112646E-12

Unit = abmho

Corresponding SI Dimension = S

Unit to SI Dimension Factor = 1E+09

## Electric current

Unit = A (ampere)

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 1

Unit = ampere

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 1

Unit = amp

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 1

Unit = abA (abampere)

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 1E+01

Unit = abampere

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 1E+01

Unit to SI Dimension Scaling Factor = 0

Unit = statA (statampere)

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 3.335635E-10

Unit = statampere

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 3.335635E-10

Unit = biot

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 1E+1

Unit = Bi (biot)

Corresponding SI Dimension = A

Unit to SI Dimension Factor = 1E+1

## Electric dipole moment

Unit C*m

Corresponding SI Dimension = C*m

Unit to SI Dimension Factor = 1

Unit = D (debye)

Corresponding SI Dimension = C*m

Unit to SI Dimension Factor = 3.33564E-30 #

Unit = debye

Corresponding SI Dimension = C*m

Unit to SI Dimension Factor = 3.33564E-30 #

## Electric potential

Unit = V (volt)

Corresponding SI Dimension = V

Unit to SI Dimension Factor = 1

Unit = volt

Corresponding SI Dimension = V

Unit to SI Dimension Factor = 1

Unit = statV (statvolt)

Corresponding SI Dimension = V

Unit to SI Dimension Factor = 2.99793E+10

Unit = statvolt

Corresponding SI Dimension = V

Unit to SI Dimension Factor = 2.99793E+10

Unit = abV (abvolt)

Corresponding SI Dimension = V

Unit to SI Dimension Factor = 1E-08

Unit = abvolt

Corresponding SI Dimension = V

Unit to SI Dimension Factor = 1E-08

Unit = J/A*s

Corresponding SI Dimension = V

Unit to SI Dimension Factor = 1

## Electric quadrupole moment

Unit = C*m**2

Corresponding SI Dimension = C*m**2

Unit to SI Dimension Factor = 1

## Electric resistance

Unit = ohm

Corresponding SI Dimension = ohm

Unit to SI Dimension Factor = 1

Unit = kilohm

Corresponding SI Dimension = ohm

Unit to SI Dimension Factor = 1E+03

Unit = hectohm

Corresponding SI Dimension = ohm

Unit to SI Dimension Factor = 1E+02

Unit = microhm

Corresponding SI Dimension = ohm

Unit to SI Dimension Factor = 1E-06

Unit = nanohm

Corresponding SI Dimension = ohm

Unit to SI Dimension Factor = 1E-09

Unit = picohm

Corresponding SI Dimension = ohm

Unit to SI Dimension Factor = 1E-12

Unit = E+14ohm

Corresponding SI Dimension = ohm

Unit to SI Dimension Factor = 1E-14

Unit = statohm

Corresponding SI Dimension = ohm

Unit to SI Dimension Factor = 8.987584E+11

Unit = abohm

Corresponding SI Dimension = ohm

Unit to SI Dimension Factor = 1E-09

Unit = V/A

Corresponding SI Dimension = ohm

Unit to SI Dimension Factor = 1

Unit = m**2*kg/s**3*A**2

Corresponding SI Dimension = ohm

Unit to SI Dimension Factor = 1

## Energy

Unit = J (joule)

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 1

Unit = joule

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 1

Unit N*m

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 1

Unit = kg*m**2/s**2

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 1

Unit = erg (erg)

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 1E-07

Unit = Ry (rydberg)

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 2.1798741E-18 #

Unit = rydberg

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 2.1798741E-18 #

Unit = eV (electronvolt)

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 1.60217733E-19 #

Unit = electronvolt

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 1.60217733E-19 #

Unit = ITcal (calorie, international)

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 4.1868

Unit = cal (calorie, thermal)

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 4.184

Unit = calIT (calorie, international)

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 4.1868

Unit = Latm (liter atmosphere)

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 101.325

Unit = Btu (British thermal unit)

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 1055.06

Unit = Whr (watt-hour, absolute)

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 3600

Unit = Wh (watt-hour, absolute)

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 3600

Unit = ftlbf

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 1.35582 (CRC)

Unit = inlbf

Corresponding SI Dimension = J

Unit to SI Dimension Factor =0.112985

Unit = hp*h

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 2.68452E+06 (CRC)

Unit = hp*hr

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 2.68452E+06 (CRC)

Unit = hphr

Corresponding SI Dimension = J

Unit to SI Dimension Factor = 2.68452E+06 (CRC)

## Entropy, heat capacity

Unit = J/K

Corresponding SI Dimension = J/K

Unit to SI Dimension Factor = 1

Unit = Cl (clausius)

Corresponding SI Dimension = J/K

Unit to SI Dimension Factor = 4.184

Unit = clausius

Corresponding SI Dimension = J/K

Unit to SI Dimension Factor = 4.184

## Force

Unit = N (newton)

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 1

Unit = newton

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 1

Unit = kg*m/s**2

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 1

Unit = dyn (dyne)

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 1E-05

Unit = dyne

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 1E-05

Unit = kgf (killogram-force)

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 9.80665

Unit = kg (killogram-force)

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 9.80665

Unit = gf (gram-force)

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 9.80665E-03

Unit = g (gram-force)

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 9.80665E-03

Unit = lbf (pound-force)

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 4.448221677 (CRC)

Unit = lb (pound-force)

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 4.448221677 (CRC)

Unit = pdl (poundal)

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 1.38255E-01 (CRC)

Unit = poundal

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 1.38255E-01 (CRC)

Unit = kip (=1000 lbf)

Corresponding SI Dimension = N

Unit to SI Dimension Factor = 4.448221677E+03

## Frequency

Unit = Hz (hertz)

Corresponding SI Dimension = Hz

Unit to SI Dimension Factor = 1

Unit = hertz

Corresponding SI Dimension = Hz

Unit to SI Dimension Factor = 1

Unit = s**-1

Corresponding SI Dimension = Hz

Unit to SI Dimension Factor = 1

Unit = cps (cycles/s)

Corresponding SI Dimension = Hz

Unit to SI Dimension Factor = 1

Unit = cycles/s

Corresponding SI Dimension = Hz

Unit to SI Dimension Factor = 1

## Kinematic viscosity

Unit = m**2/s

Corresponding SI Dimension = m**2/s

Unit to SI Dimension Factor = 1

Unit = St (stokes)

Corresponding SI Dimension = m**2/s

Unit to SI Dimension Factor = 1E-04

Unit = stokes

Corresponding SI Dimension = m**2/s

Unit to SI Dimension Factor = 1E-04

## Length

Unit = fathom (marine depth)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1.8288

Unit = earthradius (geocentric distance)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 6378140

Unit = solarradius (heliocentric distance)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 6.962743E+08

Unit = earthradii (geocentric distance)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 6378140

Unit = solarradii (heliocentric distance)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 6.962743E+08

Unit = m (meter)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1

Unit = meter

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1

Unit = metre

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1

Unit = A (angstrom)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1E-10

Unit = ang (angstrom)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1E-10

Unit = angstrom

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1E-10

Unit = mu (micron)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1E-06

Unit = E-03mm

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1E-06

Unit = micron

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1E-06

Unit = f (fermi)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1E-15

Unit = fermi

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1E-15

Unit = in (inch)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 0.0254

Unit = inch

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 0.0254

Unit = inches

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 0.0254

Unit = ft (feet)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 0.3048

Unit = 4ft

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1.2192

Unit = foot

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 0.3048

Unit = feet

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 0.3048

Unit = yd (yard)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 0.9144

Unit = yard

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 0.9144

Unit = mi (mile)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1609.344

Unit = mile

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1609.344

Unit = mil

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 2.54E-05

Unit = AU (astronomical unit)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 1.49600E+11

Unit = pc (parsec)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 3.08568E+16

Unit = parsec

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 3.08568E+16

Unit = ly (light year)

Corresponding SI Dimension = m

Unit to SI Dimension Factor = 9.46053E+15

## Magnetic field strength

Unit = oersted

Corresponding SI Dimension = A/m

Unit to SI Dimension Factor = 79.577472

Unit = Oe

Corresponding SI Dimension = A/m

Unit to SI Dimension Factor = 79.577472

## Magnetic flux density

Unit = Wb/m**2

Corresponding SI Dimension = T

Unit to SI Dimension Factor = 1

Unit = tesla

Corresponding SI Dimension = T

Unit to SI Dimension Factor = 1

Unit = kg/A*s**2

Corresponding SI Dimension = T

Unit to SI Dimension Factor = 1

Unit = gauss

Corresponding SI Dimension = T

Unit to SI Dimension Factor = 1E-04

Unit = G (gauss)

Corresponding SI Dimension = T

Unit to SI Dimension Factor = 1E-04

Unit = Mx/cm**2

Corresponding SI Dimension = T

Unit to SI Dimension Factor = 1E-04

## Magnetic flux

Unit = Wb (weber)

Corresponding SI Dimension = Wb

Unit to SI Dimension Factor = 1

Unit = weber

Corresponding SI Dimension = Wb

Unit to SI Dimension Factor = 1

Unit = kg*m**2/A*s**2

Corresponding SI Dimension = Wb

Unit to SI Dimension Factor = 1

Unit = Mx (maxwell)

Corresponding SI Dimension = Wb

Unit to SI Dimension Factor = 1E-08

Unit = maxwell

Corresponding SI Dimension = Wb

Unit to SI Dimension Factor = 1E-08

## Magnetomotive force

Unit = Wb (weber)

Corresponding SI Dimension = Wb

Unit to SI Dimension Factor = 1

Unit = weber

Corresponding SI Dimension = Wb

Unit to SI Dimension Factor = 1

Unit = kg*m**2/A*s**2

Corresponding SI Dimension = Wb

Unit to SI Dimension Factor = 1

Unit = Mx (maxwell)

Corresponding SI Dimension = Wb

Unit to SI Dimension Factor = 1E-08

Unit = maxwell

Corresponding SI Dimension = Wb

Unit to SI Dimension Factor = 1E-08

## Mass

Unit = kg (kilogram)

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1

Unit = kilogram

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1

Unit = lb (pound avoirdupois)

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 0.45359237

Unit = pound

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 0.45359237

Unit = oz (ounce avoirdupois)

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 2.83495E-02 #

Unit = ounce

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 2.83495E-03 #

Unit = g (gram)

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1E-03

Unit = gram

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1E-03

Unit = gr (grain)

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 6.479891E-05

Unit = grain

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 6.479891E-05

Unit = Da (dalton)

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1.66054E-27 #

Unit = dalton

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1.66054E-27 #

Unit = u (unified atomic mass unit)

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1.66054E-27 #

Unit = amu

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1.66054E-27 #

Unit = ton (2000 lb)

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 9.0718474E+02 (CRC)

Unit = t (tonne, metric ton)

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1E+03

Unit = metric ton

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1E+03

Unit = kiloton

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1E+06

Unit = short ton

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 907.18474

Unit = tonne

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1E+03

Unit = Msol (mean solar mass)

Corresponding SI Dimension = kg

Unit to SI Dimension Factor = 1.98E+30

## Molar entropy, molar heat capacity

Unit = J/K*mol

Corresponding SI Dimension = J/K*mol

Unit to SI Dimension Factor = 1

Unit = eu (entropy unit)

Corresponding SI Dimension = J/K*mol

Unit to SI Dimension Factor = 4.184

## Noise Intensity

Unit = dB (decibel)

Corresponding SI Dimension = db

Unit to SI Dimension Factor = 1

Unit = decibel

Corresponding SI Dimension = db

Unit to SI Dimension Factor = 1

Unit = B (Bel)

Corresponding SI Dimension = db

Unit to SI Dimension Factor = 10

Unit = Bel

Corresponding SI Dimension = db

Unit to SI Dimension Factor = 10

## Plane angle

Unit = rad (radian)

Corresponding SI Dimension = rad

Unit to SI Dimension Factor = 1

Unit = radian

Corresponding SI Dimension = rad

Unit to SI Dimension Factor = 1

Unit = deg (degree)

Corresponding SI Dimension = rad

Unit to SI Dimension Factor = 1.7453293E-02 (CRC)

Unit = degree

Corresponding SI Dimension = rad

Unit to SI Dimension Factor = 1.7453293E-02 (CRC)

Unit = min (minute)

Corresponding SI Dimension = rad

Unit to SI Dimension Factor = 2.9088821E-04 (CRC)

Unit = sec (second)

Corresponding SI Dimension = rad

Unit to SI Dimension Factor = 4.8481368E-06 (CRC)

## Power

Unit = dB (decibel)

Corresponding SI Dimension = db

Unit to SI Dimension Factor = 1

Unit = decibel

Corresponding SI Dimension = db

Unit to SI Dimension Factor = 1

Unit = B (Bel)

Corresponding SI Dimension = db

Unit to SI Dimension Factor = 10

Unit = Bel

Corresponding SI Dimension = db

Unit to SI Dimension Factor = 10

## Pressure

Unit = Pa (pascal)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 1

Unit = pascal

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 1

Unit = micropascal

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 1E-06

Unit = MPa (=10**6 Pa)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 1E+06

Unit = milliPa (=10**-3 Pa)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 1E-03

Unit = N/m**2

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 1

Unit = kg/m*s**2

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 1

Unit = atm (standard atmosphere)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 1.01325E+05

Unit = atmosphere

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 1.01325E+05

Unit = bar (bar)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 1E+05

Unit = Torr (torr)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 133.322 #

Unit = Tor (torr)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 133.322 #

Unit = mmHg (millimeter of Hg - conventional)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 133.322 #

Unit = inHg (inches of Hg - conventional)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 3386.39 (CRC)

Unit = mmH2O (millimeters of water - conventional)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 9.80665

Unit = cmHg (centimeter of Hg - conventional)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 1333.22 #

Unit = psi (pounds force per square inch)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 6.894757E+03 #

Unit = psia (pounds force per square inch, absolute)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 6.894757E+03 #

Unit = psf (pounds force per square foot)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 47.8803 (CRC)

Unit = lbf/in**2

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 6.894757E+03 #

Unit = ksi (10**3 pounds force per square inch)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 6.894757E+06 #

Unit = E+03ksi (10**6 pounds force per square inch)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 6.894757E+09 #

Unit = Msi (10**6 pounds force per square inch)

Corresponding SI Dimension = Pa

Unit to SI Dimension Factor = 6.894757E+09 #

## Radiation

Unit = Gy (gray)

Corresponding SI Dimension = J/kg

Unit to SI Dimension Factor = 1

Unit = gray

Corresponding SI Dimension = J/kg

Unit to SI Dimension Factor = 1

Unit = rad

Corresponding SI Dimension = J/kg

Unit to SI Dimension Factor = 1E-02

Unit = Sv (sievert)

Corresponding SI Dimension = Sv

Unit to SI Dimension Factor = 1

Unit = sievert

Corresponding SI Dimension = Sv

Unit to SI Dimension Factor = 1

Unit = rem

Corresponding SI Dimension = J/kg

Unit to SI Dimension Factor = 1E-02

Unit = Bq (becquerel)

Corresponding SI Dimension = Bq

Unit to SI Dimension Factor = 1

Unit = becquerel

Corresponding SI Dimension = Bq

Unit to SI Dimension Factor = 1

Unit = Ci (curie)

Corresponding SI Dimension = s**-1

Unit to SI Dimension Factor = 3.7E+10

Unit = curie

Corresponding SI Dimension = s**-1

Unit to SI Dimension Factor = 3.7E+10

Unit = R (Rontgen)

Corresponding SI Dimension = C/kg

Unit to SI Dimension Factor = 2.58E-04

Unit = Rontgen

Corresponding SI Dimension = C/kg

Unit to SI Dimension Factor = 2.58E-04

Unit = Roentgen

Corresponding SI Dimension = C/kg

Unit to SI Dimension Factor = 2.58E-04

## Solubility parameter

Unit = cal**0.5/cm**1.5

Corresponding SI Dimension = J**0.5/m**1.5

Unit to SI Dimension Factor = 2.0454828E+03

Unit = cal**0.5/m**1.5

Corresponding SI Dimension = J**0.5/m**1.5

Unit to SI Dimension Factor = 2.0454828

Unit = H (hildebrand)

Corresponding SI Dimension = J**0.5/m**1.5

Unit to SI Dimension Factor = 2.0454828E+03 (CRC)

Unit = hildebrand

Corresponding SI Dimension = J**0.5/m**1.5

Unit to SI Dimension Factor = 2.0454828E+03

## Temperature

Unit = K (kelvin)

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 1

Unit = kelvin

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 1

Unit = degK

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 1

Unit = degC (degree Centigrade/Celsius)

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 1

Unit to SI Dimension Scaling Factor = 273.15

Unit = Cel (degree Celsius)

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 1

Unit to SI Dimension Scaling Factor = 273.15

Unit = Centigrade

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 1

Unit to SI Dimension Scaling Factor = 273.15

Unit = Celsius

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 1

Unit to SI Dimension Scaling Factor = 273.15

Unit = C (degree Centigrade/Celsius)

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 1

Unit to SI Dimension Scaling Factor = 273.15

Unit = degF (degree Fahrenheit)

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 5/9

Unit to SI Dimension Scaling Factor = 255.372222

Unit = F (degree Fahrenheit)

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 5/9

Unit to SI Dimension Scaling Factor = 255.372222

Unit = Fahrenheit

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 5/9

Unit to SI Dimension Scaling Factor = 255.372222

Unit = degR (degree Rankine)

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 5/9

Unit = R (degree Rankine)

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 5/9

Unit = Rankine

Corresponding SI Dimension = K

Unit to SI Dimension Factor = 5/9

## Time

Unit = s (second)

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 1

Unit = sec (second)

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 1

Unit = second

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 1

Unit = min (minute)

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 60

Unit = minute

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 60

Unit = h (hour)

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 3.600E+03

Unit = hr (hour)

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 3.600E+03

Unit = hour

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 3.600E+03

Unit = d (day)

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 8.6400E+04

Unit = day

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 8.6400E+04

Unit = days

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 8.6400E+04

Unit = wk (week)

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 6.04800E+05

Unit = week

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 6.04800E+05

Unit = month

Corresponding SI Dimension = mo

Unit to SI Dimension Factor = 1

Unit = mo

Corresponding SI Dimension = mo

Unit to SI Dimension Factor = 1

Unit = a (mean solar year)

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 3.1556926E+07

Unit = yr (mean solar year)

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 3.1556926E+07

Unit = year (calendar)

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 3.1536E+07

Unit = Sv (svedberg)

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 1E-13

Unit = svedberg

Corresponding SI Dimension = s

Unit to SI Dimension Factor = 1E-13

## Velocity

Unit = m/s

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 1

Unit = mph

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 0.447037222

Unit = fps

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 0.3048

Unit = fpm

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 0.00508 (CRC)

Unit = ips

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 0.0254

Unit = kmps

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 1E+03

Unit = %/s

Corresponding SI Dimension = %/s

Unit to SI Dimension Factor = 1

## Volume

Unit = m/s

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 1

Unit = mph

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 0.447037222

Unit = fps

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 0.3048

Unit = fpm

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 0.00508 (CRC)

Unit = ips

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 0.0254

Unit = kmps

Corresponding SI Dimension = m/s

Unit to SI Dimension Factor = 1E+03

Unit = %/s

Corresponding SI Dimension = %/s

Unit to SI Dimension Factor = 1

## Other

Unit = kayser (reciprocal length)

Corresponding SI Dimension = m**-1

Unit to SI Dimension Factor = 1E-02

Unit = m**-1 (reciprocal length)

Corresponding SI Dimension = m**-1

Unit to SI Dimension Factor = 1

Unit = 1/m (reciprocal length)

Corresponding SI Dimension = m**-1

Unit to SI Dimension Factor = 1

Unit = ppm (parts/million)

Corresponding SI Dimension = ppm

Unit to SI Dimension Factor = 1

Unit = ppb (parts/billion)

Corresponding SI Dimension = ppm

Unit to SI Dimension Factor = 1E+03

Unit = ppt (parts/thousand)

Corresponding SI Dimension = ppm

Unit to SI Dimension Factor = 1E-03

Unit = pph (parts/handred)

Corresponding SI Dimension = ppm

Unit to SI Dimension Factor = 1E-04

Unit = 1.0E-06lb/lb

Corresponding SI Dimension = kg/kg

Unit to SI Dimension Factor = 1E+06

Unit = 1.0E-06lb/ft**3

Corresponding SI Dimension = kg/m**3

Unit to SI Dimension Factor = 1.60185E+07

Unit = %

Corresponding SI Dimension = %

Unit to SI Dimension Factor = 1

Unit = percent

Corresponding SI Dimension = %

Unit to SI Dimension Factor = 1

Unit = wt%

Corresponding SI Dimension = %

Unit to SI Dimension Factor = 1

Unit = vol%

Corresponding SI Dimension = vol%

Unit to SI Dimension Factor = 1

Unit = cycles

Corresponding SI Dimension = cycles

Unit to SI Dimension Factor = 1

Unit = 1000cycles

Corresponding SI Dimension = cycles

Unit to SI Dimension Factor = 1E+03

Unit = 1000 cycles

Corresponding SI Dimension = cycles

Unit to SI Dimension Factor = 1E+03

Unit = E+06cycles

Corresponding SI Dimension = cycles

Unit to SI Dimension Factor = 1E+06

Unit = arcs

Corresponding SI Dimension = arcs

Unit to SI Dimension Factor = 1

Unit = cents

Corresponding SI Dimension = cents

Unit to SI Dimension Factor = 1

Unit to SI Dimension Scalling Factor = 0

Unit = %IACS

Corresponding SI DImension = 1/ohm*m

Unit to SI Dimension Factor = 58

Unit = %IACSwt

Corresponding SI Dimension = 1/ohm*m

Unit to SI Dimension Factor = 6.5242

Unit to SI Dimension Scaling Factor = 1

Unit = percentIACS

Corresponding SI DImension = 1/ohm*m

Unit to SI Dimension Factor = 58

Unit = percentIACSwt

Corresponding SI Dimension = 1/ohm*m

Unit to SI Dimension Factor = 6.5242

Unit to SI Dimension Scaling Factor = 1

Unit = 1/ohm*m

Corresponding SI Dimension = 1/ohm*m

Unit to SI Dimension Factor = 1

Unit to SI Dimension Scaling Factor = 1