SI units

Systeme International d’Unites is an internationally accepted system of units of measure together with their symbols. It is founded on seven basic quantities: length, mass, time, electric current, temperature, luminosity and amount of substance, each of which have a related basic unit: metre, kilogramme, second, ampere, kelvin, candela and mole. There are also many derived units, eg newton, joule, watt, with their agreed symbols.