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the amount of light absorbed by a body defined as opaque is influenced considerably by the nature of the body's surface
Значение термина the amount of light absorbed by a body defined as opaque is influenced considerably by the nature of the body's surface в knolik
the amount of light absorbed by a body defined as opaque is influenced considerably by the nature of the body's surface - The amount of light absorbed by a body defined as opaque is influenced considerably by the nature of the body's surface
the amount of light absorbed by a body defined as opaque is influenced considerably by the nature of the body's surface - Thus, a polished white or metallic surface reflects the greater part of the light which falls upon it: a black unpolished surface absorbs nearly all of it, because the light penetrating between the particles of the surface layer is unable to escape by reflection and is consequently absorbed. A body's ability to retain the light which falls on it is called its absorptive power. One which absorbed all light radiations of whatever kind would be called a perfectly black body, though no such body exists. Lamp - black, however, nearly fulfils the condition. See Light; Spectroscopy.absorption of gases. All the plants which contain chlorophyll absorb their carbon from the carbonic acid of the air, or, if the plants are submerged, from the gas held in solution by the water, which gas is decomposed under the influence of light by the cells which contain chlorophyll. If a water plant is placed in water containing carbonic acid and is exposed to sunshine, bubbles of oxygen are given off from the cut stem or leaf. The carbonic acid is decomposed in the chlorophyll corpuscles in such a way that part of the oxygen is restored to the atmosphere, and the residue combines with the water to form such compounds as starch. A certain temperature is required, and light is indispensable. No carbon is absorbed by green plants in any other way; and there is no instance in nature of the conversion of carbonic acid into similar carbonic compounds.
Liquids are able to absorb gases even when not entering into chemical combination with them. The volume of gas which the unit volume of any liquid - water, oil, liquid metals - can absorb depends on the nature of the gas and on the temperature. The number of unit volumes of a gas which can be absorbed by a unit volume of a liquid at 15° C. is called the absorption coefficient of the liquid. The absorption coefficient of carbonic acid in water is 1, of oxygen 0-035, of nitrogen 0.017.electrical absorption. For any given insulator, or substance which resists the passage of electricity, there is a dielectric constant which is the ratio of the induction to the electric intensity. But substances other than gases do not instantaneously acquire their maximum induction in an electric field. It seems that they require time to absorb the charge; and this phenomenon is called electric absorption. If a Leyden jar be given a charge and its potential is measured, the potential will be found to fall for some time, but will at last become constant. Similarly, if the jar is discharged the whole electric induction does not disappear at once; but successive discharges getting smaller and smaller may be obtained. See Absorbent Materials; Adsorption: Gas.
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