The diagram below shows pupils demonstrating a property of air. Study and use it to answer the questions...

The diagram below shows pupils demonstrating a property of air. Study and use it to answer the questions that follow.
(a) State the property of air being demonstrated by the pupils above.
(b) State one way in which the property of air pupils are demonstrating is helpful in our daily life.
(c) Give any two other properties of air that the pupils would demonstrate.
(i)
(ii)