Units Fundamental SI Supplementary SI Other SI SI Prefixes moon phases

SI Prefixes The SI prefixes are used to describe SI quantity units. They simplify unit expression and hence can be handled more easily. For example, 2.5 pico second (ps) is in fact 2.5 x 10-12 second; 3.4 micro meter (mm) is in fact 3.4 x 10-6 m. The prefixes and their corresponding factors are listed below: Prefix Symbol Factor yotta Y 1024 zetta Z 1021 exa E 1018 peta P 1015 tera T 1012 giga G 109 mega M 106 kilo k 103 hecto h 102 deca da 101 deci d 10-1 centi c 10-2 milli m 10-3 micro m 10-6 nano n 10-9 pico p 10-12 femto f 10-15 atto a 10-18 zepto z 10-21 yocto y 10-24

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