  Grains are widely assumed to be characterized by a single temperature --
derived either from the configurational entropy, or employing the kinetic
theory. Yet granular media do have two temperatures, $T_g$ and $T$, pertaining
to the grains and atoms. It is argued here that a two-temperature plasma yields
a more useful analogy for grains than a molecular gas: (1)~Irreversible
collisions also occur in plasma, to reach the equilibrium of equal temperature.
(2)~The plasma energy is not linear in the two temperatures; it is quadratic in
the temperature difference, minimal at equilibrium. Both points have valid
analogues in grains, yielding useful insights.
