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Measures and Units


This resource provides clear definitions of all the units, prefixes and styles of the Système International (SI), as well as traditional and industry-specific units. The terms are taken from a broad range of subjects including astronomy, electromagnetics, geology, photography, mathematics, meteorology, physics, and temperature.
On this page: A to arbitrary.

Title Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A:  A 1  2  Next > 

A (length, area, time, electromagnetics, astronomy, informatics, music)
aanom (time)
aastr (time)
abdaraf (electric elastance)
abmho (electricity)
absolute (in philosophy)
absolute practical system (electromagnetics)
absolute system (electromagnetics)
absolute zero (in physics, thermodynamics)
acoustic ohm (acoustics)
acre (measure of land area)
acre·foot (volume)
acre·inch (volume)
agauss (time)
Alfvén number (physics)
alpha particle mass (sub-atomic physics)
alphanumeric character (computer science)
AM (chemical symbol)
amagat density (molecular density, molecular volume)
ampere (measure)
ampere·turn (magnetomotive force)
angstrom (measure)
angstrom star (physics)
apgar (medicine)
API gravity (petroleum processing)
apostilb (optics)
apoth. (mass)
Arabic numerals (numerical symbol)