When a hand pump is used to inflate the tires of a bicycle, the pump gets warm after a while. Why?

Intra aortic balloon pump is inflated by

A vessel of volume V is evacuated by means of a piston air pump Upon cach double stroke a piston pump sucks in a volume V of air and expels it. The process is assumed to be isothermal, and the gas is ideal. When this pump is used to evacuate the air from a vessel with a volume V, it performs n double strokes. The initial pressure inside the vessel is p_0 which is equal to the atmospheric pressure. (a) Calculate the final pressure inside the vessel.

Explain why: (a) air is used to inflate tyres. (b) steel is used to make railway lines.

[A]: The "balloon pump" is used to assist the heart. [R]: Balloon is used when heart is removed from the body.

What makes a balloon get inflated when air is filled in it?

Why does a balloon inflate when air is blown into it ?