(physics) A measure of the absorption of electromagnetic radiation as it passes through a specific substance; the fraction of incident radiation absorbed by unit mass or unit thickness; absorptivity.

(physics, astronomy) A spectral line that corresponds to the absorption of electromagnetic radiation at a specific wavelength; the pattern of such lines is characteristic of specific atoms or molecules in the path of the radiation.

(physics) The retention of polarization of a dielectric material after removal of the electric field.

(physics) A container, that allows light to pass through, used to store and study liquids and their optical absorption rate.

plural of absorption system

(physics) An instrument used to measure force, by measuring the energy absorbed via friction or electrical resistance.

(astronomy) A dark nebula; a diffuse mass of interstellar gas and dust that absorbs all incident radiation without reemission.

(physics) plural of absorption spectrum

plural of absorption factor

(astronomy) plural of absorption nebula