R is the gas constant in dimensions of [energy temperature-1 parts-1]
The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... Molar gas constant (also known as universal gas constant, usually denoted by symbol R) is the constant occurring in the universal gas equation, i. ...
DiffusionCoefficient - The relationship between the formation factor and the diffusioncoefficient of porous materials saturated with concentrated electrolytes: Theoretical and experimental considerations - DiffusionCoefficient
This approach, however, yields a diffusioncoefficient tensor that characterizes a particular experiment and cannot, in general, be applied to different scenarios.
In those cases where the self-diffusion coefficients of all the diffusing species are nearly identical, the diffusion potential will be nearly zero, and the apparent bulk diffusioncoefficient will be nearly equal to the agglomerated diffusioncoefficient.
The diffusion equation is a nonlinear partial differential equation, which describes the density fluctuations in a material undergoing diffusion.
It is also used in population genetics to describe the 'diffusion' of alleles in a finite population.
The diffusion equation can be derived in a straightforward way from the continuity equation, which states that a change in density in any part of the system is due to inflow and outflow of material into and out of that part of the system.
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