Internal energy

Internal energy
Common seembols	U
SI unit	J
In SI base units	m2*kg/s2
Derivations frae ither quantities	$U=\sum _{i}E_{i}\!$

In thermodynamics, the internal energy o a seestem is the energy contained within the seestem, excludin the kinetic energy o motion o the seestem as a whole an the potential energy o the seestem as a whole due tae freemit force fields.