This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
 Units Package Tutorial Functions »

# Units Package

There are many systems of units. The particular set of units that is used depends on factors as various as the field of study and the author's country of origin. The function Convert provides conversion between different units.
 Convert[old,newunits] convert old to a form involving a combination of newunits

Converting units.

This converts meters per second into miles per hour.
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You have to give prefixes for units as separate words.
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The conversion of temperature units is different from most other unit conversions, because it is not multiplicative. This is simply because the zeros of various systems are set at different values. For example, zero degrees Centigrade is the same as 32 degrees Fahrenheit.
 ConvertTemperature[temp,oldunits,newunits] convert temp from the oldunits scale to the newunits scale

Converting temperatures.

This converts the temperature. Convert only converts the units of temperature.
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Temperature scales.

To organize the use of units, certain standardized systems have been developed. These include the International System (SI) and systems using particular metric units, such as the meter/kilogram/second system. The functions SI, MKS, and CGS convert various units into the standard systems.
 SI[expr] convert expr to SI units (International System) MKS[expr] convert expr to MKS units (meter/kilogram/second) CGS[expr] convert expr to CGS units (centimeter/gram/second)

Conversion of units into standard systems.

The International Standard unit for pressure is the Pascal.
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 You can request information about any unit.
 Yocto 10-24 Deca 101 Zepto 10-21 Hecto 102 Atto 10-18 Kilo 103 Femto 10-15 Mega 106 Pico 10-12 Giga 109 Nano 10-9 Tera 1012 Micro 10-6 Peta 1015 Milli 10-3 Exa 1018 Centi 10-2 Zetta 1021 Deci 10-1 Yotta 1024

SI unit prefixes.

 Abampere Abcoulomb Abfarad Abhenry Abmho Abohm Abvolt Amp Biot Coulomb Farad Gilbert Henry Mho Ohm Siemens Statampere Statcoulomb Statfarad Stathenry Statohm Statvolt Volt

Electrical units.

 AU Bolt Cable Caliber Centimeter Chain Cicero Cubit Didot DidotPoint Ell Fathom Feet Fermi Foot Furlong Hand Inch League LightYear Link Meter Micron Mil Mile NauticalMile Parsec Perch Pica Point Pole PrintersPoint Rod Rope Skein Span Stadion Stadium StatuteMile SurveyMile XUnit Yard

Units of length.

Units of information.

Units of time.

 AMU AtomicMassUnit Dalton Geepound Gram Kilogram MetricTon Quintal Slug SolarMass Tonne

Units of mass.

Units of weight.

Units of force.

Units of inverse length.

 Bag Barrel BoardFoot Bucket Bushel Butt Cord Cup Drop Ephah Fifth Firkin FluidDram FluidOunce Gallon Gill Hogshead Jeroboam Jigger Last Liter Magnum Minim Noggin Omer Pint Pony Puncheon Quart RegisterTon Seam Shot Stere Tablespoon Teaspoon Tun UKGallon UKPint WineBottle

Units of volume.

Units of viscosity.

 Apostilb Candela Candle FootCandle Hefner Lambert Lumen Lumerg Lux Nit Phot Stilb Talbot

Units of types of luminous energy and intensity.

Angles.

Units of power.

 Acre Are Barn Hectare Rood Section Township

Units of area.

 Dozen Gross Mole

Amounts of substances.

Acceleration due to gravity.

Magnetic units.

Unit multipliers.

Units of pressure.

Units of energy.

Unit of frequency.

Unit of speed.

Unit of fineness for yarn or thread.