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[tex] E_{internal} = E_{translational} + E_{vibrational} + E_{rotational} + E_{other} [/tex]

where ## E_{other} ## could be chemical energy, magnetic energy, electrostatic energy etc.

Then he circles ## E_{translational} + E_{vibrational} + E_{rotational} ## and states that the RANDOM portions of these energy contributions represents the thermal energy. He says there is an ordered contribution from these terms and an unordered contribution and that this unordered (or random) contribution is the thermal energy.

What does the ordered vs. random contributions mean? I have no idea what that means.