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SI Units SI is the most commonly used system of units in the world. It is sometimes incorrectly referred to as the metric system. SI stands for the French phrase Système International d’Unités. The SI system of units defines seven basic units. All other units can be derived from these basic units. The basic units are: Property Length Mass Time Electric Current Temperature Amount of Substance Light Intensity Name metre kilogram second ampere kelvin mole candela Symbol m kg s A K mol cd R Laugesen http://tinyrock.com Scientists use a prefix in front of an SI unit to indicate its order of magnitude. For example the following three are the same: 0.000000000000001 m 1 x 10-15 m 1 fm Which one would you prefer to write? Multiple 1024 1021 1018 1015 1012 109 106 103 102 101 10-1 10-2 10-3 10-6 10-9 10-12 10-15 10-18 10-21 10-24 Prefix yotta zetta exa peta tera giga mega kilo hecto deca deci centi milli micro nano pico femto atto zepto yocto Symbol Y Z E P T G M k h da d c m µ n p f a z y R Laugesen http://tinyrock.com