General Physics Standard International Units (S. I. Units) Basic quantity Mass Unit Symbol kilogram Kg meter m seconds s kelvin K Ampere A mol mol Length Time Temperature Electric Current Quantity of matter Units Formula d speed = a = S. I. Units ms t v−u ms t −1 −2 Kgms work = F × d Kgm s work P = ρ = F Kgm A m R = −2 Joule 2 −3 Watt −1 Kgm V p = m × v V = 2 Kgm s time V −1 −1 2 −2 Kgm A I Pascal −2 2 Kgm A Q s −3 Kgms W Newton −2 F = ma P ower = Derived unit s s −3 Volt −3 Ohm Volt V = W Q 2 V = I = Kgm s −2 Q Q t Q = I × t = As 2 V = Kgm s −2 As 2 V = Kgm A −1 s −3 Homogeneity of equations Each side of the equations is composed of the same base units Prefixes Symbol Name Value T Terra G Giga ×10 M Mega ×10 K Kilo ×10 - - d deci ×10 c centi ×10 m milli ×10 μ micro ×10 η nano ×10 ×10 12 9 6 3 −1 −2 −3 −6 −9 Used in Physics P3 Symbol Name p pico Value ×10 −12