A tall vertical vessel contains a gas composed of two kinds
of molecules of masses m1 a nd m2, with m2 > m1. The concentrations
of these molecules at the bottom of the vessel are equal to n1 a nd n2
respectively, with n2 > n1. Assuming the temperature T and the
free-fall acceleration g to be independent of the height, find the height
at which the concentrations of these kinds of molecules are equal.