Fundamentals of Gas Kinetics

The individual molecules or gas particles contained in a volume are in constant motion and collide with each other. In doing so, the particles change their velocity each time they collide. From a statistical point of view, all velocities are possible but with differing probability. 

Maxwell and Boltzmann found the following relationship for the velocity distribution of the gas particles [3]  

From this, it is apparent that there does not exist a molecule with a velocity of zero or with an infinitely high velocity. The location of the most probable velocity (maximum, Vp) is a function of the mean gas temperature. Moreover, the molecule velocity depends on the molar mass. The most likely velocity can be stated through 

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