diffusiondɪˈfyu ʒən
diffusion (n)
- plural
- diffusions
English Definitions:
diffusion (noun)
(physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration
diffusion (noun)
the spread of social institutions (and myths and skills) from one society to another
dissemination, diffusion (noun)
the property of being diffused or dispersed
dispersion, dispersal, dissemination, diffusion (noun)
the act of dispersing or diffusing something
"the dispersion of the troops"; "the diffusion of knowledge"
diffusion (Noun)
the act of diffusing or dispersing something, or the property of being diffused or dispersed; dispersion
diffusion (Noun)
the scattering of light by reflection from a rough surface, or by passage through a translucent medium
diffusion (Noun)
the intermingling of the molecules of a fluid due to random thermal agitation
diffusion (Noun)
the spread of cultural or linguistic practices, or social institutions, in one or more communities
diffusion (Noun)
Exchange of airborne media between regions in space in an apparently random motion of a small scale.
diffusion (Noun)
the movement of water vapor from regions of high concentration (high water vapor pressure) toward regions of lower concentration.
Diffusion
Diffusion is the net movement of anything (for example, atoms, ions, molecules, energy) generally from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in Gibbs free energy or chemical potential. It is possible to diffuse "uphill" from a region of lower concentration to a region of higher concentration, like in spinodal decomposition. The concept of diffusion is widely used in many fields, including physics (particle diffusion), chemistry, biology, sociology, economics, and finance (diffusion of people, ideas, and price values). The central idea of diffusion, however, is common to all of these: a substance or collection undergoing diffusion spreads out from a point or location at which there is a higher concentration of that substance or collection. A gradient is the change in the value of a quantity, for example, concentration, pressure, or temperature with the change in another variable, usually distance. A change in concentration over a distance is called a concentration gradient, a change in pressure over a distance is called a pressure gradient, and a change in temperature over a distance is called a temperature gradient. The word diffusion derives from the Latin word, diffundere, which means "to spread out." A distinguishing feature of diffusion is that it depends on particle random walk, and results in mixing or mass transport without requiring directed bulk motion. Bulk motion, or bulk flow, is the characteristic of advection. The term convection is used to describe the combination of both transport phenomena. If a diffusion process can be described by Fick's laws, it's called a normal diffusion (or Fickian diffusion); Otherwise, it's called an anomalous diffusion (or non-Fickian diffusion).
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