The number of drops of water, counted in falling-drop method using stalagmometer is 100, whereas the number of drops of an organic liquid is 280. Calculate the surface tension of the organic liquid if the surface tension of water is `0.07275 Nm^(-1)` and the densities of water and the organic liquid are `0.998 xx 10^3 kg m^(-3)` and `0.755 xx 10^3 kg m^(-3)` respectively.

Answer

`0.01966 Nm^(-1)`