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

$A$ straw of circular cross-section of radius $R$ and negligible thickness is dipped vertically into a liquid of surface tension $T$. If the contact angle between the liquid and the straw material is $53^{\circ}$,what is the force acting on the straw due to the surface tension of the liquid? (Given: $\cos 53^{\circ} = 0.6$)

When there is no external force,the shape of a liquid drop is determined by

At which of the following temperatures,the value of surface tension of water is minimum in $^oC$?

Why are clothes easily washed by soap or detergent?

The surface tension of most of the liquids decreases with a rise in: