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5. Glossary
Absorption coefficient; Coefficient d'absorption
Fraction "a" of the radiation absorbed by a material.
Coefficient de réflexion ; Reflection coefficient
Fraction "r" of the radiation reflected by the material.
Transmission coefficient; Coefficient de transmission
Fraction "t" of radiation through which the material passes.
Emissivity
The opposite of absorption: a material emits radiation by drawing on its internal energy store, so its temperature decreases and it cools.
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