Typically, cuvettes are across, to allow for easy calculations of coefficients of absorption.
2.
A " perfectly black " body would be one that absorbed completely, radiation falling upon it that is, a body with a coefficient of absorption equal to unity.
3.
Here, the dimensionless coefficient of absorption ( or the absorptivity ) is the fraction of incident light ( power ) that is absorbed by the body when it is radiating and absorbing in thermodynamic equilibrium.
4.
:" For a body of any arbitrary material emitting and absorbing thermal electromagnetic radiation at every wavelength in thermodynamic equilibrium, the ratio of its emissive power to its dimensionless coefficient of absorption is equal to a universal function only of radiative wavelength and temperature.
Meaning
a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber; "absorptance equals 1 minus transmittance" Synonyms: absorption coefficient, absorptance,
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