Question

The tremendous pressure exerted by air can be demonstrated by :

• A. Crushing can experiment
• B. Hydraulic press
• C. Altimeter
• D. All

Answer 1

The correct option is A Crushing can experiment

Crushing can experiment:

Take an empty and absolutely clean oil can and put in it about $0.25$ litres of water. Heat the can in fire till all 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 on 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 crushes the can.