define emissive power of body ?
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Amount of Heat Radiates by body per unit area in per unit time
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Emissive power
The total amount of energy is emitted in an unit area with the respect of an unit time in every possible direction by a body is said to be the emissive power of the body. It is also termed as emittence power of the body.
As similar to the power, emissive power = (total energy/total time taken), that means energy exerted by a body in each unit area in every unit of time.
*It should have to noted that in emissive power the temperature is always constant.
It is the ratio of the power of a body at a given temperature to the power of a black body at that temperature. That means,
Emissivity = the total emissive power of a body/total emissive power of a perfectly black body
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