Surface tension of a liquid, at critical temperature is

The value of surface tension of a liquid at critical temperature

Surface tension is

How does the surface tension of a liquid vary with increase in temperature ?

How does the surface tension of a liquid vary with increase in temperature ?

When a vertical capillary of length l with a sealed upper end was brought in contact with the surface of a liquid, the level of this liquid rose to the height h . The liquid density is rho , the inside diameter the capillary is d , the contact angle is theta , the atmospheric pressure is rho_(0) . Find the surface tension of the liquid. (Temperature in this process remains constant.)

Why does the boundary between liquid phase and gaseous phase disappear on heating a liquid upto critical temperature in a closed vessel ? In this situation what will be the state of the substance ?

What happens if a liquid is heated to the critical temperature of its vapour?

When a vertical capillary of length with the sealed upper end was brought in contact with the surface of a liquid, the level of this liquid rose to the height h . The liquid density is rho , the inside diameter the capillary is d , the contact angle is theta , the atmospheric pressure is rho_(0) . Find the surface tension of the liquid. (Temperature this process remains constant.)

A : Evaporation occurs at any temperature whereas the boiling point depends on the external pressure. R : Evaporation of a liquid occurs from the surface of a liquid at all temperature whereas boiling takes place at a temperature determined by the external pressure.

Surface tension of a liquid is independent of the area of surface. Why?