| Webster's Online Dictionary |
| Expressions | Definition | ||
| Extinction coefficient | The extinction coefficient for a particular substance is a way of measuring how well electromagnetic radiation is absorbed at a particular wavelength. It is a term widely used in UV/VIS_spectroscopy. (references) | ||
Source: compiled by the editor from various references; see credits. | Top | ||
| Expressions | Domain | Definition | |
| Extinction coefficient | Aerospace | 1: A measure of the space rate of diminution, or attenuation, of any transmitted light, due to absorption and scattering. (references) | |
| 2: In meteorology, a measure of the space rate of diminution, or extinction, of any transmitted light; thus, it is the attenuation coefficient applied to visible radiation. The extinction coefficient is identified as dI = -I dx or I = I0 e-x where I is the illuminance (luminous flux density) at the selected point in space, I0 is the illuminance at the light source; and x is the distance from the source. When so used, the extinction coefficient equals the sum of the medium's absorption coefficient and scattering coefficient, each computed as a weighted average over all wavelengths in the visible spectrum. As long as scattering effects are primary, as in the lower atmosphere, the value of the extinction coefficient is a function of the particle size of atmospheric suspensoids. It varies in order of magnitude from 10 per kilometer with very low visibility to 0.01 per kilometer in very clear air. (references) | |||
| Extinction coefficient | Business | The sum of the absorption coefficient and the scattering coefficient. (references) | |
| Extinction coefficient | Environment | A measure of the ability of particles or gases to absorb and scatter photons from a beam of light; a number that is proportional to the number of photons removed from the sight path per unit length. See absorption. (references) | |
| Extinction coefficient (absorptivity) | Geology | A constant used in the Beer-Lambert Law which relates the concentration of the substance being measured (in moles) to the absorbance of the substance in solution (how well the substance in solution blocks light beamed through it from getting out on the other side). (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
