Like wise pressure of gas on walls
^ r to Y and Z axis are respectively,
[ For convenience only we have treated
P_{x} , P_{y} , P_{z } are different, or we have determined pressure
thrice over as all N molecules were considered to be moving along X, Y and Z all the three axis.]
Finally, we define Root Mean Square (R.M.S) velocity C of molecules as Square root of the
Mean Square Velocity.
It is customary to call this equation, i.e., pressure expression, as the equation of state. In the
above derivation of pressure expression, all but the last assumption viz, Average K.E of any molecules
is proportional to the absolute temperature of the gas, has been invoked at some stage or the other.

Index
12.1 Solids
12.2 Liquids
12.3 Gases
12.4 Gas Laws
12.5 Equation of State :Ideal Gas Equation
12.6 Kinetic Theory of Ideal Gases
Chapter 13
