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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 apostilb.

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)
AD (time)
AM (time)
API gravity (petroleum processing)
Alfvén number (rheology)
Avogadro constant (fundamental constant)
aanom (time)
aastr (time)
abampere (electric current)
abcoulomb (electric charge)
abdaraf (electric elastance)
abfarad (electric capacitance)
abhenry (electromagnetic inductance)
abmho (electric conductance)
abohm (electric resistance)
absolute (electromagnetics)
absolute magnitude (astronomy)
absolute practical system (electromagnetics)
absolute system (electromagnetics)
absolute temperature (temperature)
absolute zero (temperature)
abvolt (electric potential, electromotive force)
acid number (biochemistry)
acoustic ohm (acoustics)
acre (area)
acre·foot (volume)
acre·inch (volume)
agauss (time)
age (geology)
algebraic (mathematics)
alpha particle mass (sub-atomic physics)
amagat density (molecular density, molecular volume)
amp (electrics)
ampere (electric current strength)
ampere·turn (magnetomotive force)
angstrom (physics)
angstrom star (physics)
anomalistic (astronomy)
ap. (mass)
apgar (medicine)
apostilb (luminance, irradiance)