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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 quintillion)

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