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Prefixes and Magnitudes

To make sense of the vast range over which physical quantities are measured, prefixes are used as a short-cut to writting the magnitude using scientific notation

atto a10-18
femto f10-15
pico p10-12
nano n10-9
micro μ10-6
mili m10-3
Kilo k103
Mega M106
Giga G109
Tera T1012
Peta P1015
Exa E1018

Other prefixes which are commonly used but are not strictly part of the SI system.

centi c10-2
deci d10-1
Deca Da101
Hecto h102