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SwissBorgSaver
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What is the difference between emissivity and absorptance?
According to Gustav Kirchhoff's law of thermal radiation, the absorptance of a medium is identical to its emissivity: the more an object can absorb electromagnetic radiation, the more it can also emit the same kind of radiation. The absorptance of a surface can actually depend on the direction of incoming light.
According to Gustav Kirchhoff's law of thermal radiation, the absorptance of a medium is identical to its emissivity: the more an object can absorb electromagnetic radiation, the more it can also emit the same kind of radiation. The absorptance of a surface can actually depend on the direction of incoming light.