The average gravitational potential energy of every molecular species is given by
equipartition theorem as kT / 2 per molecule.
TomVonk says: August 10, 2010 at 1:53 am «I observe that after 300 comments, not a single one contested either the time symmetry or the energy
equipartition law.
The problem here is that the energy
equipartition law is a statistical result, not a precise law such as «Action and reaction are equal and opposite.»
Principle of
equipartition of energy --(e.g. here), where internal energy of a gas (or liquid or solid) is equally divided among all the degrees of freedom (so long as LTE applies).