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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: specific to sunspot number.

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SPECmark (informatics)
speed of light (Science)
SPF (abbreviation)
sphere (in geometry)
square (in geometry)
square grade (mathematics)
sr (symbol)
ss (medicine)
SSF (mechanics)
St (mechanics, rheology)
st (volume)
standard cable (engineering)
standard gravity (mechanics)
stat (radiation physics)
statampere (electricity)
statcoulomb (electric charge)
statdaraf (electric elastance)
statfarad (electricity)
stathenry (electromagnetism)
statmho (electricity)
statohm (electricity)
statute (in law)
statΩ (electromagnetics)
Staudinger value (chemistry)
Stefan constant (mechanics)
stellar magnitude (in astronomy)
sthéne (mechanics)
stilb (technology)
Sumner unit (chemistry)
sunspot number (astronomy)