Molecular diffusion is the motion of atoms, molecules, or other particles of a gas or liquid at temperatures above absolute zero. The rate of this movement...

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

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...

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

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

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...

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...

differential diffusion of chemical species and chemical reaction. The instability mechanism is surprising because a pure diffusion, such as molecular diffusion, would...

and temperature. Expressed as a molecular flux, Knudsen diffusion follows the equation for Fick's first law of diffusion: J K = ∇ n D K A {\displaystyle...

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

directly without the need for isotope labeling. Brownian motion Diffusion Molecular diffusion S. J. Chalk (1997). A. D. McNaught, A. Wilkinson (ed.). "IUPAC...

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

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

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

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

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...

Molecular machines are a class of molecules typically described as an assembly of a discrete number of molecular components intended to produce mechanical...

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

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

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

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

is diffusion through the heterosphere. Therefore, hydrogen escape on Earth is diffusion-limited. By considering one dimensional molecular diffusion of...

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

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

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

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...

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

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

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

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