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Fractions

Prefix Factor Fraction
centi 10-2 1/100 (part per hundred)
milli 10-3 1/1,000 (part per thousand)
micro 10-6 1/1,000,000 (ppm, part per million)
nano 10-9 1/1,000,000,000 (ppb, part per billion)
pico 10-12 1/1,000,000,000,000 (ppt, part per trillion)
femto 10-15 1/1,000,000,000,000,000 (ppq, part per quadrillion)
atto 10-18 1/1,000,000,000,000,000,000 (part per quintiilion)