Question

Read the following paragraph and answer the question.
If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box.
How will you state the principle briefly?

Accepted Answer

Principle of heat exchange states that the heat energy lost by hot object is always equal to heat gained by cold object provided that the system of both the objects is isolated.
Note: Heat is transferred to and from objects, via three processes: conduction, radiation, and convection. Conduction is heat travelling through a solid material. On hot days, heat is conducted into your home through the roof, walls, and windows. Radiation is heat travelling in the form of visible and non-visible light. Sunlight is an obvious source of heat for homes. Convection is another means for the heat from your walls and ceiling to reach you. Hot air naturally rises, carrying heat away from your walls and causing it to circulate throughout your home. As the hot air circulates past your skin (and you breathe it in), it warms you.

Important Questions on Heat

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