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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: P to Planck length.

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
P:  A 1  2  Next > 

P (mechanics)
p.r.n. (abbreviation)
p.s.i. (pressure)
Pa (mechanics)
parsec (astronomy)
pascal (unit of pressure)
pascal·second (rheology)
pastille dose (radiation physics)
pebi- (informatics)
Péclet number (chemical engineering)
perche (region, former county, France)
period (in geologic time)
permicron (physics)
permittivity (physics)
peta- (prefix)
pH (chemistry)
ph (photics)
pi (mathematics)
pico- (prefix)
pièze (mechanics)
pipe (mechanical device)
pitch (in music)
pK (chemistry)
planck (physics)
Planck constant (radiation physics)