Abstract
In this paper we present a macroscopic theory of thermal emissivity of materials incorporating the effect of the extinction coefficient on the intensity transmission coefficient and the critical angle. Results have been presented for the emissivity of various materials (e.g. silver, aluminium, glass and water) for both Gardon's theory and the present theory. It is seen that the present theory successfully explains the observed thermal emissivity of metals (Al and Ag) as well as non-metals (glass and water).
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