Surface tension tends to minimise the surface area of a liquid. Suggest an experiment to prove this. (Follow the pattern: Required materials, Procedure, Expected observation).

What is the relation between rate of reaction and surface area. Write an experiment to prove it.

A wire ring of internal radius 3 cm and external radius 3.2 cm is rested on the surface of a liquid and is then raised. An extra pulling force equivalent to the weight of 3.03 g is required before the film breaks than it is after. Calculate the surface tension of the liquid.