5.40. (a) What do you mean by Surface Tension of a liquid?
(b) Explain the factors which can affect the surface tension of a liquid.
5.40. (a) What do you mean by Surface Tension of a liquid?
(b) Explain the factors which can affect the surface tension of a liquid.
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1 Answer
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5.40. (a) Surface tension: It is defined as the force acting per unit length perpendicular to the line drawn on the surface.
(b) Surface tension of a liquid depends upon following factors.
(i) Temperature: Surface tension decreases with rise in temperature. As the temperature of the liquid increases the average kinetic energy of the molecules increases. Thus, there is a decrease in intermolecular force of attraction which decreases the surface tension.
(ii) Nature of the liquid: Greater the magnitude of intermolecular forces of attraction in the liquid, greater will be the value of surface tension.
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