Changes

The units module comes with ConTeXt's default distribution, and can be accessed via <{{cmd>|usemodule</cmd>}}[units].

* This runtime loadable module implements a way of defining units. The core macro is <{{cmd>|dimension</cmd>}}, a rather clever one that is able to cooperate with some other dimension related macros. As said, this module enables user to enter:

(Note that the space after <{{cmd>|Second</cmd> }} needs to be explicitly specified; otherwise, it will get eaten.)

* Units act upon signals that they insert in the text, in case no quantity is given you need to start the unit sequence using <{{cmd>|Unit</cmd>}}

This definition means that we can ask for the meaning of a unit using <{{cmd>|unitmeaning</cmd> }} and get a list of used units by saying <{{cmd>|placelistofunits</cmd>}}.

We have to use the command <{{cmd>|unitmeaning</cmd> }} instead of <{{cmd>|meaning</cmd>}}, simply because the latter is a TeX primitive we don't want to lose. We use the label text mechanism for translations.

[[httphttps://www.unceasyunitconverter.educom/~rowlett/units/index.html How Many? A Dictionary of Units of MeasurementEasy Unit Converter]]

* Prefixes: <{{cmd>|Atto</cmd> }} a, <{{cmd>|Femto</cmd> }} f, <{{cmd>|Pico</cmd> }} p, <{{cmd>|Nano</cmd> }} n, <{{cmd>|Micro</cmd> }} μ, <{{cmd>|Milli</cmd> }} m, <{{cmd>|Centi</cmd> }} c, <{{cmd>|Deci</cmd> }} d, <{{cmd>|Hecto</cmd> }} h, <{{cmd>|Kilo</cmd> }} k, <{{cmd>|Mega</cmd> }} M, <{{cmd>|Giga</cmd> }} G, <{{cmd>|Tera</cmd> }} T, <{{cmd>|Peta</cmd> }} P, <{{cmd>|Exa</cmd> }} E (missing: <{{cmd>|Zetta</cmd> }} Z, <{{cmd>|Yotta</cmd> }} Y, <{{cmd>|Zepto</cmd> }} z, <{{cmd>|Yocto</cmd> }} y)* Suffixes: <{{cmd>|Linear</cmd> }} ¹, <{{cmd>|Square</cmd> }} ², <{{cmd>|Cubic</cmd> }} ³, <{{cmd>|Inverse</cmd> }} or <{{cmd>|ILinear</cmd> }} ^-1, <{{cmd>|ISquare</cmd> }} ^-2, <{{cmd>|ICubic</cmd> }} ^-3* Fraction: <{{cmd>|Per</cmd>}}, <{{cmd>|Percent</cmd>}}, <{{cmd>|Permille</cmd>}}, <{{cmd>|Promille</cmd>}}* Time: <{{cmd>|Second</cmd>}}, <{{cmd>|Minute</cmd>}}, <{{cmd>|Hour</cmd>}}, <{{cmd>|Day</cmd>}}, <{{cmd>|Month</cmd>}}, <{{cmd>|Year</cmd>}}* Length, Area, Volume: <{{cmd>|Meter</cmd>}}, <{{cmd>|Angstrom</cmd>}}, <{{cmd>|Foot</cmd>}}, <{{cmd>|Inch</cmd>}}, <{{cmd>|Liter</cmd>}}* Mass, Force and Pressure: <{{cmd>|Gram</cmd>}}, <{{cmd>|Atom</cmd>}}, <{{cmd>|Newton</cmd>}}, <{{cmd>|Pascal</cmd>}}, <{{cmd>|Mol</cmd>}}, <{{cmd>|At</cmd>}}, <{{cmd>|Atm</cmd>}}, <{{cmd>|Bar</cmd>}}, <{{cmd>|Force</cmd>}}* Energy, Electricity and Magnetism: <{{cmd>|Joule</cmd>}}, <{{cmd>|Watt</cmd>}}, <{{cmd>|Cal</cmd>}}, <{{cmd>|Farad</cmd>}}, <{{cmd>|Henry</cmd>}}, <{{cmd>|Ohm</cmd>}}, <{{cmd>|Siemens</cmd>}}, <{{cmd>|Ampere</cmd>}}, <{{cmd>|Coulomb</cmd>}}, <{{cmd>|Volt</cmd>}}, <{{cmd>|Tesla</cmd>}}, <{{cmd>|Gauss</cmd>}}, <{{cmd>|VoltAC</cmd>}}, <{{cmd>|VoltDC</cmd>}}, <{{cmd>|EVolt</cmd>}}, <{{cmd>|Weber</cmd>}}* Temperature: <{{cmd>|Degrees</cmd>}}, <{{cmd>|Kelvin</cmd>}}, <{{cmd>|Celsius</cmd>}}, <{{cmd>|Fahrenheit</cmd>}}* Angle: <{{cmd>|Rad</cmd>}}, <{{cmd>|Deg</cmd>}}, <{{cmd>|Sterant</cmd>}}* Frequency, Optics and Acoustics: <{{cmd>|Hertz</cmd>}}, <{{cmd>|RevPerSec</cmd>}}, <{{cmd>|RevPerMin</cmd>}}, <{{cmd>|Candela</cmd>}}, <{{cmd>|Lux</cmd>}}, <{{cmd>|Bell</cmd>}}* Chemistry and Radiation: <{{cmd>|Atom</cmd>}}, <{{cmd>|Mol</cmd>}}, <{{cmd>|Molair</cmd>}}, <{{cmd>|Equivalent</cmd>}}, <{{cmd>|Bequerel</cmd>}}, <{{cmd>|Sievert</cmd>}}, <{{cmd>|Gray</cmd>}}* Informatics: <{{cmd>|Baud</cmd>}}, <{{cmd>|Bit</cmd>}}, <{{cmd>|Byte</cmd>}}

In MkIV you can use the built-in <{{cmd>|unit</cmd> }} command. This time we don't use commands, if only because it is somewhat cumbersome. Let's give a few examples:

[[Category:MathSciences]]