This video lecture from Liquids and Solids (F.Sc. First Year Chemistry) covers the definition and the chemistry of the evaporation, the concept of the vapor pressure and its co-relation with temperature. Different methods of measuring the vapor pressure are also discussed. 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.