SI+Units+and+metric+prefixes

This link is to a useful website that summarises the [|SI Units], look in particular at the seven base units (table 1) and the derived units that have special symbols (table 3).

This is a very clear summary of the [|prefixes for the metric system] (e.g. what giga, mega, pico and micro, etc. mean). It also explains why of the prefixes seem a bit odd to English speakers (e.g. why //milli-// does not stand for a million).

Some of my own notes:

N = Force = ma = kgm/s 2 J = Energy = mc 2 = kgm 2 /s 2 Hz = Frequency = 1/s Pa = Pascals = pressure = force per unit area = N/m 2 = kg/ms 2 W = Watts = Joules per second = J/s Bq = Becquerel = 1 decay per second = rate of decay = 1/s

Giga = G = 10 9 = billion Micro = m = 10 **-6** = millionth