Velocity distribution of atoms

[Niles]

Homework Statement

Hi

If I have a gas of atoms confined to a (3D) box, then the probability of an atom having a speed (v_x, v_y, v_z) is given by the Maxwell distribution. Say I now make a hole in the box, such that the atoms can "fly" out of it (see attached picture). Would I still be able to describe the components by a Maxwell distribution?


Niles.

 

[Niles]

I would say that it is still given by a Maxwell distribution, but something about this I can't quite understand: When I plot the distribution, the probability of having a negative velocity is zero. So after choosing a coordinate system, how would I ever be able to get a negative velocity?Niles.