Question

Take a tin can with a lid and fill it half with water. Heat the can on a candle flame till water boils. Let it boil for a few minutes and immediately put the lid tightly on the can. Pour fresh water over the can. You can see a shape change for the tin box. What is the reason for the change in shape?

• A. Pressure inside the can is less than that outside
• B. Pressure inside the can is more than that outside
• C. Pressure inside the can is same as that outside
• D. Pressure inside the can is equal to the atmospheric pressure

Answer 1

The correct option is A

Pressure inside the can is less than that outside

As water is poured over the can, some steam in the can condenses into water, reducing the amount of air inside. The pressure of air inside the can is less compared to the pressure exerted by the air from outside the can. As a result, the can gets compressed.