what is mean by critical temperature? What is the effect of temperature on surface tension?
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Variation of surface tension with temperature - definition
It is easier to stretch the surface of a liquid the warmer it gets, because the molecules at the surface are "hopping around" more, the higher the temperature is. So the surface tension always decreases with increasing temperature.
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A measure of the ability of a substance, or more generally of any physical system, to transfer heat energy to another physical system. The temperature of a substance is closely related to the average kinetic energy of its molecules.
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