when you heat the water from its top level it does not become warm
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You can't actually lit a candle upside down then how can you warm the water from up side.
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Answer:
No, it is not correct. Though it can be said that heating water like this will take relatively more time as compared to normal heating.
Explanation:
When water is heated up, its density decreases and it rises up and the water with higher density i.e., cold water will stay at the bottom.
When heating from the top, the water at the top will become hot first thus leaving no space for the hot water to go to. The heat will be slowly and gradually transferred to the whole pan of water during this process.
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