Heat transfers from a hot body to a cold body. Give an illustration.
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Heat flows from hot to cold. ... It is important to emphasize that this statement of the 2nd law applies to the spontaneous flow of heat from hot to cold. It is possible, of course, to make a cool object in a warm place cooler - this is what a refrigerator does - but this involves the input of some external energy.
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Heat transfers takes place from a hot body onto a cold body due to the phenomenon of it reaching its state of least energy.
If you put a small hot piece of iron into a cup containing a little quantity of icy cold water, you will find after sometime that the iron has cooled down, losing all its heat energy en route making the water warmer.
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