Question

The tremendous pressure exerted by air can be demonstrated by:
(A) Crushing can experiment
(B) Hydraulic press
(C) Altimeter
(D) All

Answer 1

Hint Every substance is made up of molecules which stays together with the help of the molecular attraction. These molecules on receiving any energy from the external force or impact expands contracts depending on the increment or decrement of the internal energy value respectively. We have to know about the concept of molecular expansion of force inside a particle when we are writing this answer.

Complete step by step answer
We should know that crushing can experiment. Take an empty and absolutely clean Mobil oil can and put in it about 0.25 litres of water.
Great the can in fire till all at the air is expelled out and the steam comes out freely from its mouth screw. The mouth of the can with a lid and immediately remove it away from the fire pour cold water on the can. It is found that the can gets crushed.
The reason is that by pouring cold water, the steam changes into water. Thereby causing a vacuum inside the can. Thus the tremendous atmospheric pressure, exerts pressure from outside and crushed the can.

So, the correct answer is Option A.

Note We should know that the main aim behind the hating up can is to see that boiling turns into vapour and then forces the molecules which are present in the can outside the can. But when we put the can into the cold water we suddenly cool it.