Measures and Units

A Dictionary of Weights, Measures, and Units, edited by Donald Fenna, Oxford University Press
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.
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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)
Ha (element)
ha (element, symbol)
half-life (in physics)
half-line (in physics)
hand (in anatomy)
hardness numbers (engineering)
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 length (astronomy)
Hz (abbreviation)