Kirchhoff's law of thermal radiation formula
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Kirchhoff’s radiation law is one of the fundamental laws of thermal radiation and does not apply to other types of radiation. The law was established by G. R. Kirchhoff in 1859 on the basis of the second law of thermodynamics and was subsequently confirmed experimentally. According to Kirchhoff’s radiation law a body that, at a given temperature, exhibits a stronger absorptivity must also exhibit a more intensive emission. For instance, if a platinum plate partially covered with platinum black is heated to incandescence, the blackened end will glow much brighter than the light end.
In heat transfer, Kirchhoff's law of thermal radiation refers to wavelength-specific radiative emission and absorption by a material body in thermodynamic equilibrium, including radiative exchange equilibrium.
Kirchhoff's law, which states that theemissivity of a body which is inthermal equilibrium with its surrounding is equal to its absorptivity of the body. It should be noted that the source temperature is equal to the temperature of the irradiated surface.
In heat transfer, Kirchhoff's law of thermal radiation refers to wavelength-specific radiative emission and absorption by a material body in thermodynamic equilibrium, including radiative exchange equilibrium.
Kirchhoff's law, which states that theemissivity of a body which is inthermal equilibrium with its surrounding is equal to its absorptivity of the body. It should be noted that the source temperature is equal to the temperature of the irradiated surface.
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