7. Paheli had bought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle in it now. Can you give the reason for this ?

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Solution

The mechanisms that alter the physical properties of any substance are reversible.
Heating causes expansion, which can be easily reversed.
The metal cap expands after being immersed in hot water, making it easier to remove.

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Paheli had brought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this

Question 19.2

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Q. Paheli had bought a new bottle of pickles from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this?

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The mechanisms that alter the physical properties of any substance are reversible.Heating causes expansion, which can be easily reversed.The metal cap expands after being immersed in hot water, making it easier to remove.

The mechanisms that alter the physical properties of any substance are reversible.
Heating causes expansion, which can be easily reversed.
The metal cap expands after being immersed in hot water, making it easier to remove.