Molecular diffusion, often simply called diffusion, is the thermal motion of all (liquid or gas) particles at temperatures above absolute zero. The rate...

atomistic point of view, diffusion is considered as a result of the random walk of the diffusing particles. In molecular diffusion, the moving molecules...

Fick's laws of diffusion describe diffusion and were first posited by Adolf Fick in 1855 on the basis of largely experimental results. They can be used...

molecular diffusion, and its mathematical aspect is captured by the diffusion equation. In turbulent flows, on top of mixing by molecular diffusion,...

mainly water, in biological tissues, in vivo and non-invasively. Molecular diffusion in tissues is not random, but reflects interactions with many obstacles...

diffusivity or diffusion coefficient is usually written as the proportionality constant between the molar flux due to molecular diffusion and the negative...

operating in the regime of free molecular flow, where the movement of the gas molecules can be better understood as diffusion than by conventional fluid dynamics...

gradients, and high velocities. It occurs much more rapidly than molecular diffusion and is therefore extremely important for problems concerning mixing...

Gaseous diffusion is based on Graham's law, which states that the rate of effusion of a gas is inversely proportional to the square root of its molecular mass...

and temperature. Expressed as a molecular flux, Knudsen diffusion follows the equation for Fick's first law of diffusion: JK=∇nDKA{\displaystyle J_{K}=\nabla...

heat conduction (energy transfer), fluid flow (momentum transfer), molecular diffusion (mass transfer), radiation and electric charge transfer in semiconductors...

and diffusion ordered nuclear magnetic resonance spectroscopy (DOSY). The apparent hydrodynamic size can then be used to approximate molecular mass using...

generated. This process is facilitated by molecular diffusion and convection. With respect to molecular diffusion, dispersion occurs as a result of an unequal...

the rate of diffusion or of effusion of a gas is inversely proportional to the square root of its molecular weight. Thus, if the molecular weight of one...

also: Molecular diffusion Heat conduction (i.e., diffusion of heat) This disambiguation page lists articles associated with the title Thermal diffusion. If...

transport are simple diffusion, facilitated diffusion, filtration, and/or osmosis. Passive transport follows Fick's first law. Diffusion is the net movement...

in rigid solids. It does not include transport of substances by molecular diffusion. Advection is sometimes confused with the more encompassing process...

the principles of diffusion. Facilitated diffusion differs from simple diffusion in several ways: The transport relies on molecular binding between the...

different types of diffusion: molecular, Brownian and turbulent. Molecular diffusion occurs in gases, liquids, and solids. Diffusion is a result of thermal...

to: Molecular diffusion, spontaneous dispersion of mass (distinct from migration, caused by an external force) Conduction of heat Momentum diffusion Diffusion...

proportionality (kT/f) constant relies on the molecular quantity . This constant equates to the diffusion coefficient (D), which is a macroscopic quantity...

tracer diffusion determined by watching the movement of an isotope in the material of interest. Brownian motion Diffusion Molecular diffusion S. J. Chalk...

{1}{2}}\,\mathrm {Sc} ^{\frac {1}{3}}} This form is applicable to molecular diffusion from a single spherical particle. It is particularly valuable in...

formulated Fick's laws that enabled the calculation of the rates of molecular diffusion in biological systems. Building upon the gene-chromosome theory of...

Collective cell migration, describing the movements of group of cells Molecular diffusion, in physics Migration (chemistry), type of reaction in organic chemistry...

describe the flow of water through porous media are Darcy's law, the diffusion and Laplace equations, which have applications in many diverse fields...

defined as the point where the coefficient of Eddy diffusion is equal to the coefficient of molecular diffusion. The region below the turbopause is known as...

T)} χ{\displaystyle \chi } particle concentration; D{\displaystyle D} diffusion coefficient; and DT{\displaystyle D_{T}} the thermodiffusion coefficient...

Boltzmann equation. Viscosity in gases arises principally from the molecular diffusion that transports momentum between layers of flow. An elementary calculation...

the signal acquired with diffusion MRI. In this model, biological tissue contains two distinct environments: molecular diffusion of water in the tissue...