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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: H to Hz.

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
H:  A

H (electromagnetics, fundamental constant, astronomy)
H and D (photography)
half-life (in physics)
half-line (in physics)
hand (in anatomy)
hardness numbers (engineering)
hartley (communications)
Hartman number (rheology)
Hartree (atomic physics)
haze factor (meteorology)
head of liquid (pressure)
hectare (unit, measure)
hecto- (prefix)
hefner candle (optics)
hehner number (analytical chemistry)
helion mass (sub-atomic physics)
helium scale (temperature)
hertz (unit, measure)
hexadecimal notation (computer science)
HF (symbol)
Hg (symbol)
Hn (sub-atomic physics)
Hoppus foot (volume)
hounsfield unit (radiation physics)
Hour Angle (in astronomy)
hourly difference (navigation)
HPa (pressure)
hubble (astronomy)
Hubble length (astronomy)
Hz (abbreviation)