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.
This loads the package.
This converts meters per second into miles per hour.
In:= Convert[12 Meter/Second, Mile/Hour]
You have to give prefixes for units as separate words.
In:= Convert[3 Kilo Meter / Hour, Inch / Minute]
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 degrees Fahrenheit.
This converts the temperature. Convert only converts the units of temperature.
In:= ConvertTemperature[20, Fahrenheit,
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.
Conversion of units into standard systems.
The International Standard unit for pressure is the Pascal.
In:= SI[3 Atmosphere]
You can request information about any unit.
SI unit prefixes.
Units of length.
Units of information.
Units of time.
Units of mass.
Units of weight.
Units of force.
Units of inverse length.
Units of volume.
Units of viscosity.
Units of types of luminous energy and intensity.
Units of radiation.
Units of power.
Units of area.
Amounts of substances.
Acceleration due to gravity.
Units of pressure.
Units of energy.
Unit of frequency.
Unit of speed.
Unit of fineness for yarn or thread.