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# When heat transfers into a system, is the energy stored as

ISBN: 9781938168000 42

## Solution for problem 3CQ Chapter 14

College Physics | 1st Edition

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Problem 3CQ

When heat transfers into a system, is the energy stored as heat? Explain briefly.

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Solution 3CQ

Consider a very hot mug of coffee on the countertop of your kitchen.we will say that the cup of coffee has a temperature of 80°C and that the surroundings (countertop, air in the kitchen, etc.) has a temperature of 26°CI suspect that you know that the cup of coffee will gradually cool down over time.

We would say that the coffee and the mug are transferring heat to the surroundings. This transfer of heat occurs from the hot coffee and hot mug to the surrounding air. The fact that the coffee lowers its temperature is a sign that the average kinetic energy of its particles is decreasing. The coffee is losing energy. The mug is also lowering its temperature; the average kinetic energy of its particles is also decreasing. The mug is also losing energy. The energy that is lost by the coffee and the mug is being transferred to the colder surroundings. We refer to this transfer of energy from the coffee and the mug to the surrounding air and countertop as heat. In this sense, heat is simply the transfer of energy from a hot object to a colder object.

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When heat transfers into a system, is the energy stored as