Search results
Results from the WOW.Com Content Network
The term absorption refers to the physical process of absorbing light, while absorbance does not always measure only absorption; it may measure attenuation (of transmitted radiant power) caused by absorption, as well as reflection, scattering, and other physical processes. Sometimes the term "attenuance" or "experimental absorbance" is used to ...
The meaning of ABSORBANCE is the ability of a layer of a substance to absorb radiation expressed mathematically as the negative common logarithm of transmittance.
As light passes through a sample, its power decreases as some of it is absorbed. This attenuation of radiation is described quantitatively by two separate, but related terms: transmittance and absorbance.
Absorbance is a measure of the quantity of light absorbed by a sample. It is also known as optical density, extinction, or decadic absorbance. The property is measured using spectroscopy, particularly for quantitative analysis. Typical units of absorbance are called "absorbance units," which have the abbreviation AU and are dimensionless.
Different materials absorb photons of different wavelengths because absorption of a photon is an absorption of energy. Something must be done with that energy. In the case of ultraviolet and visible light, the energy is of the right general magnitude to excite an electron to a higher energy level.
The Beer-Lambert law relates the attenuation of light to the properties of the material through which the light is traveling. This page takes a brief look at the Beer-Lambert Law and explains the use of the terms absorbance and molar absorptivity relating to UV-visible absorption spectrometry.
Absorbance Definition noun (analytical chemistry) A logarithmic measure of the amount of light absorbed (at particular wavelength) as the light passes through a sample or substance. (microbiology) The measure of the amount of light absorbed by a suspension of bacterial cells or a solution of an organic molecule with the use of a colorimeter or ...
Absorbance is a measure of the amount of light absorbed by a substance when light passes through it. It quantifies how much incident light is absorbed by a material and is defined mathematically as the logarithm of the ratio of incident light intensity to transmitted light intensity.
Absorbance definition: the capacity of a substance to absorb radiation, expressed as the common logarithm of the reciprocal of the transmittance of the substance.. See examples of ABSORBANCE used in a sentence.
Absorbance refers to the amount of light absorbed by a substance when it interacts with electromagnetic radiation. It is commonly measured using a spectrophotometer or colorimeter to determine the concentration of a solute in a solution based on the Beer-Lambert Law. Definition. Related Terms. Also Found In. Subjects. Practice Questions.