Question

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What do you mean by spectral and total emissivity.?


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Answer 1

Answer:

The difference in thermal radiation from that of an ideal blackbody is expressed by the spectral emissivity, which is defined as the ratio of the spectral radiance emitted by the material to one emitted by an ideal blackbody radiator at the same temperature for the same optical and geometrical conditions.

Emittance (or emissive power) is the total amount of thermal energy emitted per unit area per unit time for all possible wavelengths. Emissivity of a body at a given temperature is the ratio of the total emissive power of a body to the total emissive power of a perfectly black body at that temperature.

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

The spectral emissivity is expressed as mean-values over wave-number intervals by means of the statistical band model. The agreement between Hottel's diagrams of total emissivities and the total emissivities calculated on the basis of spectral data is good for optical path lengths greater than 1.0 cm atm.

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