This video lecture from Gases (F.Sc. First Year Chemistry) covers the contribution of different scientists in its development, its postulates and the definitions of root mean square velocity. Detailed discussion on derivation of the gas laws through kinetic molecular theory is included in the video.. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.