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Dispersion

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	Dispersion can refer to: Biology Biological dispersal Biological dispersal Biological dispersal refers to a species movement away from an existing population or away from the parent organism. Through simply moving from one habitat patch to another, the dispersal of an individual has consequences not only for individual fitness, but also for population dynamics, population genetics, and species distribution.... , the distribution of spores, fruits and their seeds, etc. Physics A phenomenon that causes the separation of a wave into components of varying frequency: Dispersion relation Dispersion relation Dispersion relations describe the ways that wave propagation varies with the wavelength or frequency of a wave . This variation has long explained how white light is dispersed into different colors, thus making rainbows possible.... Dispersion (optics) Dispersion (optics) In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency.Media having such a property are termed dispersive media.... (see also Abbe number Abbe number In physics and optics, the Abbe number, also known as the V-number or constringence of a Transparency material, is a measure of the material's dispersion in relation to the refractive index.... ) Dispersion (water waves) Dispersion (water waves) In fluid dynamics, dispersion of ocean surface wave generally refers to frequency dispersion. Frequency dispersion means that waves of different wavelengths travel at different phase speeds.... Dielectric dispersion Dielectric dispersion In physics, dielectric dispersion is the dependence of the permittivity of a dielectric material on the frequency of an applied electric field. Because there is always a lag between changes in polarization and changes in an electric field, the permittivity of the dielectric is a complicated, complex number function of frequency of the electri... Dispersive mass transfer Dispersive mass transfer Dispersive mass transfer is the spreading of mass from highly concentrated areas to less concentrated areas. It is one form of mass transfer.Dispersive mass flux is analogous to diffusion, and is can also be described using Fick's law:... , in fluid dynamics, the spreading of mass from areas of high to low concentration Atmospheric pollution dispersion Modal dispersion Modal dispersion Modal dispersion is a distortion mechanism occurring in multimode fibers and other waveguides, in which the signal is spread in time because the Wave propagation velocity of the optical signal is not the same for all normal modes.... , spreading signals in multimode fibers and waveguides by a distortion mechanism Polarization mode dispersion Polarization mode dispersion Polarization mode dispersion is a form of modal dispersion where two different polarizations of light in a waveguide, which normally travel at the same speed, travel at different speeds due to random imperfections and asymmetries, causing random spreading of optical pulses.... (PMD), different polarizations of light in a waveguide may travel at different speeds due to random imperfections and asymmetries of the waveguide Chemistry Dispersion (chemistry) Dispersion (chemistry) A dispersion is system in which particles are dispersed in a continuous phase of a different composition . See also emulsion... , a system in which particles are dispersed in a continuous phase of a different composition London dispersion force, a form of van der Waals force Geology Dispersion (geology) Dispersion (geology) Dispersion occurs when a soil is wikt:sodic. When a sodic soil is wetted the clay particles are forced apart. This is generally a major cause of erosion.... , a process whereby sodic soil disperses when exposed to water Materials science Dispersion (materials science) Dispersion (materials science) In materials science, dispersion is the fraction of atoms of a material exposed to the surface. In general:where D is the dispersion, NS is the number of surface atoms and NT is the total number of atoms of the material.... , the fraction of atoms of a material exposed to the surface Statistics Statistical dispersion Statistical dispersion In statistics, statistical dispersion is variability or spread in a variable or a probability distribution. Common examples of measures of statistical dispersion are the variance, standard deviation and interquartile range.... , quantifiable variation of measurements of differing members of a population Coefficient of dispersion Coefficient of dispersion In probability theory and statistics, the index of dispersion, dispersion index, coefficient of dispersion, or variance-to-mean ratio , like the coefficient of variation, is a Normalization measure of the statistical dispersion of a probability distribution: it is a measure used to quantify whether a set of observed occurre... , a measure to quantify whether a set of observed occurrences are relatively clustered or dispersed Economics and finance Dispersion (finance) Dispersion (finance) Dispersion is a measure for the statistical Distribution of Portfolio returns. It is the asset-weighted standard deviation of individual portfolio returns within a comparable client group from the composite return.... , a measure for the statistical distribution of portfolio returns Price dispersion Price dispersion In economics, price dispersion is variation in prices across sellers of the same item, holding fixed the item's characteristics. Price dispersion can be viewed as a measure of trading frictions .... , variation in prices across sellers of the same item Wage dispersion Wage dispersion Wage dispersion is an economic term which refers to the amount of variation in wages encountered in an economy.... refers to the amount of variation in wages encountered in an economy