This video lecture from Liquids and Solids (F.Sc. First Year Chemistry) covers the detailed explanation of the chemistry and concept of Boiling point along with its relation with the external pressure. Energetics of phase changes including molar heat of vaporization, fusion and sublimation are also illustrated. 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.