3 . For non-linear triatomic gas = 6 4 . For linear triatomic gas = 7
Specific heat of a gas ( a ) At constant volume , CV = f / 2 R ( b ) At constant pressure , cp = ( f / 2 + 1 ) R
( c ) Ratio of specific heats of a gas at constant pressure and at constant volume is given by γ = 1 + 2 / f
Mean Free Path
The average distance travelled by a molecule between two successive collisions is called mean free path ( γ ).
Mean free path is given by γ = kT / √2 π σ 2 p
where σ = diameter of the molecule , p = pressure of the gas , T = temperature and k = Botlzmann ’ s constant .
Mean free path λ ∝ T and λ ∝ 1 / p
Brownian Motion
The continuous random motion of the particles of microscopic size suspended in air or any liquid , is called Brownian of microscopic motion .
Brownian suspended motion in both is observed with many liquids and gases .
Brownian motion is due to the unequal bombardment of the suspended Particles by the molecules of the surrounding medium .