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Surface Tension



In this experiment we are going to study surface tension. The surface of a liquid acts as a thin membrane due to the intermolecular forces between its atoms. The atoms in the body of the liquid are subjected to cohesive forces in all directions over them whereas the atoms on the surface are not subjected to liquid-liquid forces from above but adhesive e.g. liquid-air forces. In this experiment, the student will firstly compare the surface tension of liquids with different densities. Moreover, he/ she will observe the change in surface tension when temperature is changed. The student will be able to observe the change in surface tension using a stalagmometer. Differentiation between cohesive/adhesive forces and discussion on which dominates each time will be made.