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 now. Can you give the reason for this?
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Answer:
In hot water,the metal shrinks
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Answer:
Paheli could easily open the bottle after immersing the upper end of the bottle with the metal cap in hot water because metal conducts more heat and is with lesser specific heat than glass and will expand upon heating.
Before the glass starts to expand, the metal expands causing the inside diameter of the metal cap to increase which along with the force from inside would loosen the cap and push the lid open.
The thermal conductivity of the metal cap will be about 60% more than that of the glass part.
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