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

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

(chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid

(chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid

(chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid

(chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid

(chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid

(chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid

a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths

a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths