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When two diatomic molecules of a gas collide, is the collision elastic or inelastic? Is rotational KE also conserved/not conserved?

My guess is that translational KE is conserved while rotational KE isn't. I'm just guessing for the translational part, but as for the rotational part I can imagine two molecules "canceling each other out" if one spins clockwise / the other counterclockwise and they bump into each other.

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Only the total energy, linear momentum, and angular momentum are gauranteed to be conserved. Translational kinetic energy can get converted to rotational (and vibrational for that matter), and vice versa. Consider, for example, non-rotating molecules approaching each other in a broadside collision:

broadside collision

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