According to prevot's theory of heat exchange a body not only radiates heat radiations continuously at all temperature but also absorbs heat continuously from the surroundings. The heat radiates by the body per unit area per unit time does not depend upon the temperature of the surroundings but only on the temperature of the body.However,the heat radiations received by the body from its surroundings.If the body radiates more heat to the surroundings then it receives from the surrounding, the body has a net loss of heat. As a result,the body will have cooling effect. Similarly, if the body radiates less heat to the surroundings than it receives from the surroundings,the body has a net gain in heat energy. As a result,the body has heating effect.If the heat radiated by the body to the surroundings is equal to the heat received by the body from the body to the surroundings is equal to the heat received by the body from the surroundings ,the body will be in thermal equilibrium with its surroundings.
therefore,if there are a large number of bodies at the save temperature, the bodies are in dynamic thermal equilibrium. A body stops radiating energy only at absolute zero of temperature.
This is called theory of heat exchange. This theory can be used to explain why we feel cold in winter and hot in summer if we come outside home.
In the winter, the surroundings temperature is less that our body. As a result, the heat energy we radiate into the surroundings is more than the heat energy we receive from the surroundings .As a result,there is net of energy for us we feel cold. However, in summer,the surroundings temperature is more than that of our body. Therefore,the heat energy we radiate into the surroundings is less than that we receive from the surroundings. As a result, there is net gain in heat energy for us and feel hot.
therefore,if there are a large number of bodies at the save temperature, the bodies are in dynamic thermal equilibrium. A body stops radiating energy only at absolute zero of temperature.
This is called theory of heat exchange. This theory can be used to explain why we feel cold in winter and hot in summer if we come outside home.
In the winter, the surroundings temperature is less that our body. As a result, the heat energy we radiate into the surroundings is more than the heat energy we receive from the surroundings .As a result,there is net of energy for us we feel cold. However, in summer,the surroundings temperature is more than that of our body. Therefore,the heat energy we radiate into the surroundings is less than that we receive from the surroundings. As a result, there is net gain in heat energy for us and feel hot.
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