We have proved that the temperature of a mass of gas is determined by the mean kinetic energy of the molecules. We now proceed to enquire about the nature of energy possessed by a molecule. In mechanics, we are familiar with the following types of energies:

- The kinetic energy of translational motion: This is equal to 1/2
*mc*where^{2}*m*is the mass of the molecule moving with velocity*c*. - The kinetic energy of rotation: This is equal to 1/2
*Iw*where^{2}*I*is the moment of inertia of the molecule rotating with angular velocity*w*. - The vibrational energy: This is partly kinetic and partly potential. The average value of vibrational kinetic energy is equal to the average value of vibrational potential energy.
- The energy of a ...

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