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Expression for Pressure exerted by gas 
Let N number of molecules of an ideal gas of mass M, be enclosed in a cubical base of sides L. Let ith molecule move with velocity Ci , (see figure 1) and ui , vi , wi be its X, Y, Z components.
Consider only X-component of motion of
ith molecule, then the force exerted by ith molecule,
on account of its periodic collisions at 
\ Force on front wall by all 'N' molecules 
\ Pressure on front wall is 
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12.1 Solids
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with front wall and change in its momentum of
-2mu i is