Question

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).

Answer 1

’Materials required: metallic loop, thread, soap water, pin Method of experiment: 

Tie a thread to a metallic loop, immerse it in soap water and create a soap film as shown in fig. a, b, c.

Prick a portion of film using a pin. The shape of remaining portion of soap film will be as such the surface area is reduced.