Question

The surface tension of water in critical temperature

Answer 1

Surface tension is related to temperature; for that reason, when a value is given for the surface tension of an interface, temperature is also specified. The rule of thumb is that surface tension decreases with the increase of temperature, reaching a value of zero at the critical temperature. The rule - that the rate of change of molar surface energy with temperature is a constant for all liquids - is the Eötvös rule, named after the Hungarian physicist Loránd Eötvös (1848–1919). This enables the prediction of the surface tension of an arbitrary liquid pure substance at all temperatures. 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

The surface tension of water in critical temperature is "zero".

Explanation:

• First of all we have to clear the concept of Critical temperature.

• From a phase transformation we can see that Critical temperature is the temperature at which liquid phase separates from vapor phase. Above critical temperature the vapor and liquid phase does not exist so it is called "Fluid Phase".
• We know that surface tension is kind of force which separates the phase liquid from vapor, but at the critical temperature phase does not exist, so the surface tension would be zero.

• So we can say that "The surface tension of water in critical temperature is zero".

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