This video lecture from Macromolecules (F.Sc. second year Chemistry) covers an introduction to macromolecules or polymers. It describes how single unit monomers combine together in long chains to form polymers. Degree of polymerization is discussed and its effect on physical properties. The cross linking and its effect on strength is 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.