Volume 135, Number 3, August 2021
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||18 October 2021|
Temperatures in grains and plasma
Theoretische Physik, Universität Tübingen - 72076 Tübingen, Germany, EC
Received: 21 May 2021
Accepted: 9 August 2021
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, Tg 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.
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