Warm coffee is poured into a coffee mug and kept on a table, After some time we observe that coffee is not warm anymore, i.e., the temperature of coffee has decreased. Which among the following is the correct explanation for this phenomenon?

Heat energy of the warm coffee was destroyed.

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Coffee absorbed all the heat energy.

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Heat energy of the warm coffee was released into surroundings.

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Coffee mug absorbs all the energy.

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Solution

The correct option is C
Heat energy of the warm coffee was released into surroundings.

Heat energy contained by coffee when it was warm is released or transmitted into surroundings so the temperature of coffee decreases after some time. Heat lost by coffee mug is equal to the heat gained by surroundings.

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