Question

Why surface tension becomes zero at critical temperature?

Answer 1

Hey mate!!!

↪The rule of thumb is that surface tension decreases with the increase oftemperature, reaching a value of zeroat the critical temperature. ... The density, molar mass and the critical temperature of the liquid have to be known. At the critical point the surface tension is always zero.

Answer 2

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The surface temperature in a fluid arises as a result of uneven forces between liquid molecules and the surrounding gas molecules. At the critical temperature, these forces become equal and therefore, the value of surface tension becomes 0.