Any material that absorbs at least 50% of the sound energy that strikes it. The NRC is a measure of a sound absorber performance.

The part of the collector that actively absorbs the light rays. For solar tubes this is defined as the cross-sectional area of the inner tube (selective coated) measured using the outside diameter. (Eg. 0.047 x 1.72m = 0.08m) This value is used when calculating efficiency values. For solar tube collectors with reflective panels, the entire circumferential surface area of the inner tube is often used when calculating absorber area, as the reflective panel is supposed to reflect light onto underside of the evacuated tube. The Apricus AP solar collector does not use reflective panels, learn why by clicking here.

(physics) material in a nuclear reactor that absorbs radiation

a vertical, cylindrical vessel that recovers heavier hydrocarbons from a mixture of predominantly lighter hydrocarbons. Also called absorption tower. See absorb.

a tower without a condenser

a class of acoustical materials that eliminate reflections and reverberation. Common examples of absorbers include foams, fabric-covered Fiberglas batts, carpet and upholstered furniture. A common misconception is that soundproofing can be achieved by treating walls with absorptive materials. An absorber's effectiveness is frequency-related, and most common absorption materials only affect mid- and high frequencies, leaving low frequencies (bass) unaffected.

One who, or that which, absorbs.