S. I. Metric
Systeme International Metric
Basic Units
 Quantity Name of Unit Symbol length metre m mass gram g time second s temperature celcius oC electric current ampere A amount of substance mole mol luminous intensity candela cd volume litre L Derived Units Force   ( kg•m/s2 ) Newton N Pressure  ( N/m2 ) Pascal Pa Energy  ( N•m ) Joule J Frequency ( 1/s ) Hertz Hz Power ( J/s ) Watt W Electric charge ( A/s ) Coulomb C Electric potential ( J/C ) Volt V Electric resistance ( V/A ) ohm Ω Luminous flux Lumen lm
 Prefixes Prefix Name Prefic Symbol Value yotta Y 1000 000 000 000 000 000 000 000 =1024 zetta Z 1000 000 000 000 000 000 000 =1021 exa E 1000 000 000 000 000 000 = 1018 peta P 1000 000 000 000 000 = 1015 terra T 1000 000 000 000 = 1012 giga G 1000 000 000 = 109 mega M 1000 000 = 106 kilo k 1000 = 103 hecta h 100 = 102 deca da 10 = 101 ---- ---- 1 = 100 deci d 0.1 = 10-1 centi c 0.01 = 10-2 milli m 0.001 = 10-3 micro μ 0.000 001 = 10-6 nano n 0.000 000 001 = 10-9 pico p 0.000 000 000 001 = 10-12 femto f 0.000 000 000 000 001 = 10-15 atto a 0.000 000 000 000 000 001 = 10-18 zepto z 0.000 000 000 000 000 000 001 = 10-21 yocto y 0.000 000 000 000 000 000 000 001 = 10-24