A girl tried the new bottle of pickle with metal cap but could not do so then she took a bowl of hot water and immersed the upper end of the bottle in it for 5 minutes. she could open the bottle easily now what is the reason?

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Solution

Heating up the upper end of bottle will loosen the lid because the metal conducts heat. This means the metal will expand when immersed in hot water, so as the metal expands the Force required to open the bottle decreases

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