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Question

What is emissivity formula?


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Solution

  1. Emissivity can be defined as the ratio of the emissive power of body temperature and emissive power of the black body at same temperature.
  2. It is a dimensionless quantity.
  3. The value of emissivity lies between 0 to 1.
  4. For ideal black body emissivity is 1.
  5. The expression for emissivity
    e=EmissivepowerofthebodyattemperatureTEmissivepowerofablackbodyatsametemperatureTe=EE0

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