Absorptance Absorbtance

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Absorptance Absorbtance (symbol A, a, or Missing Image:IMG SRC="equat/alphasm.gif" WIDTH=14 HEIGHT=11 ALT="alpha lower case")


The ratio of the radiant flux absorbed by a body to that incident upon it. Also called absorption factor. Compare absorptivity.

 Total absorptance refers to absorptance measured over

all wavelengths.
Spectral absorptance refers to absorptance measured at a specified wavelength.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use