<P> The megajoule (MJ) is equal to one million (10) joules, or approximately the kinetic energy of a one megagram (tonne) vehicle moving at 161 km / h . </P> <P> The energy required to heat 10 liters of liquid water at constant pressure from 0 ° C (32 ° F) to 100 ° C (212 ° F) is approximately 4.2 MJ . </P> <P> One kilowatt hour of electricity is 3.6 megajoules . </P> <P> The gigajoule (GJ) is equal to one billion (10) joules. 6 GJ is about the chemical energy of combusting 1 barrel (160 l) of crude oil . 2 GJ is about the Planck energy unit . </P>

Express joules in terms of si base units