The unit of surface tension in the $SI$ system is

With the rise of temperature,the surface tension of a liquid

Arrange the following liquids in increasing order of surface tension: Water,Mercury,Soap solution.

$A$ rectangular film of liquid is expanded from $(5 \text{ cm} \times 4 \text{ cm})$ to $(7 \text{ cm} \times 8 \text{ cm})$. If the work done is $3 \times 10^{-4} \text{ J}$,the surface tension of the liquid is (nearly):

The value of surface tension of a liquid at critical temperature is

In most liquids,with a rise in temperature,the surface tension of a liquid