Last modified on 23 July 2009, at 20:10
Consider an ensemble of molecules.
Take a paticular molecule, while the others form a heat reservoir at temperature T. The energy(E)is kinetic = p2/2m = 1/2mv2,
P(E) α e-βE α e-β(p2/2m)
The probability that the molecule lies between r→ and r→+