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CBSESecondary School (English Medium) Class 7
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Heat Exchange

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Heat Exchange

When a hot object and a cold object come into contact, heat energy flows from the hot object to the cold object. This transfer continues until both objects reach the same temperature. The hot object loses heat, while the cold object gains heat.

Box of heat-resistant material

If this process happens in an isolated system (like a heat-resistant box), no heat escapes or enters from outside. In this case, the total heat lost by the hot object is equal to the total heat gained by the cold object. This is known as the Principle of Heat Exchange: Heat lost by the hot object = Heat gained by the cold object.

This principle is based on the law of conservation of energy, which states that energy cannot be created or destroyed, only transferred.

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