When a container's metal lid is stuck, we put it in hot water for a while and then it becomes easier to open it. Why is it so?

The hot water cleans it.

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The hot water will polish the metal.

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The heat expands the metal.

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The heat contracts the metal.

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Solution

The correct option is C The heat expands the metal.
Metals expand on heating and on losing heat, they contract. So when we keep the container in hot water for a while, the metal lid expands and thus makes it easier for us to open it.

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Similar questions

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Take a metallic can half filled with water and put it over the flame so that the water inside starts boiling. Now put the lid on the can and remove it from the flame. What happens to the can when we pour cold water on it?

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Ms. Rakhi, a science teacher listed some keywords on the blackboard as:

She asked students to match the keywords with the common changes which are listed as :

P: When we put a lid on a vessel containing hot milk, the inside of the lid gets wet.

Q: When we breathe onto a cold mirror it turns foggy.

R: When we spread hard butter on a warm toast, it becomes soft.

S: Solid piece of an air freshener kept on the bathroom shelf disappears in a few days.

T: When we put ice cubes in water, they disappear after some time.

U: Milk left in the freezer becomes ice cream.

P — (ii); Q — (vi); R, S — (iii); T, U — (i)
P, Q — (ii); R — (iii); S — (iv); T, U — (i)
P, Q — (v); R, T — (iii); S — (iv); U — (i)
P — (i); Q, R— (v) ; S, T — (iii); U — (iv)

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When a container's metal lid is stuck, we put it in hot water for a while and then it becomes easier to open it. Why is it so?

The correct option is C The heat expands the metal.Metals expand on heating and on losing heat, they contract. So when we keep the container in hot water for a while, the metal lid expands and thus makes it easier for us to open it.

The correct option is C The heat expands the metal.
Metals expand on heating and on losing heat, they contract. So when we keep the container in hot water for a while, the metal lid expands and thus makes it easier for us to open it.