### Collisions with container

One can calculate the number of atomic or molecular collisions with a wall of a container per unit area per unit time.Assuming an ideal gas, a derivation

^{[2]}results in an equation for total number of collisions per unit time per area:

### Speed of molecules

From the kinetic energy formula it can be shown that*v*in m/s,

*T*in kelvins, and

*R*is the gas constant. The molar mass is given as kg/mol. The most probable speed is 81.6% of the rms speed, and the mean speeds 92.1% (distribution of speeds).

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