Internal Energy
The internal energy is the total of all the energies associated with the motion of the molecules in a system. Microscopic forms of energy include those due to the rotation, vibration, translation, and interactions among the molecules of a substance. The more usual formula is given for an ideal gas.
Internal energy = 3/2 (number of moles) * (ideal gas constant) * (Temperature)
The equation is:
E= 3/2 n R T
Where:
E: Internal Energy
R: Ideal gas constant. (8.314 kg*m2/s2*mol*K)
T: Absolute Temperature in Kelvin.
n: moles