9. What are the gas particles doing inside a cubical box to give the ideal gas equation ?

            Some of the particles are moving slow, many are moving at a medium speed close to the rms velocity , and some are moving fast. The speed variation is given by the Maxwell-Boltzmann distribution.

           Each particle moves in a straight path at constant speed until it collides. Then, generally it will change its speed and direction as a result of the collision. The distribution of the components of velocity are the same in all directions of space. This is called the homogenous distribution.