Describe an experiment to show that air expands on heating.

An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into water. Explain the reason.

Explain why:

(a) we wear woollen clothes in winter?

(b) the water pipes are covered with cotton during very cold weather?

What are land and sea breezes? Explain their formation.