I read a school subject book by test measures and have intended in doubt. What I can understand is not readily found in search of other references either. Please help it. When I considered gravity, dynamic energy thought about a (x,y,z) coordinate and a speed ingredient of a molecule at the same time to demand it with kinetic energy + potential energy and was able to understand that I thought as 6 dimensions of space. f(x,y,z,vx,xy,xz)dxdydzdvxdvydvz = C exp(- ε /kT)dxdydzdvxdvydvz * ε = m/2(vx^2 + vy^2 + vz^2) + φ(x,y,z) Though I understand it, how will be that C is the fixed number if I try to really demand C? I tried to demand it from oneself, but it is it and has it at all and is not confident of a different value whenever I demand it. It is C = (mg/2kTS)*(m/2kT π )^ for the time being(3/2) I became the value that was とsufferings from unjustness tea to say, ； It was it in this way when I thought as the case that I classified into a container expensive endlessly of cross-section area S. . . In addition, how should the mean of dynamic energy demand it in this case? In addition, as for the found value, it seems to be it in a value different from mean (3kT/2) of dynamic energy of the ideal air which does not consider gravity hereby. Why seems to be ・ ・ ・?