Dimensions and units Diffusivity has dimensions of length 2 / time, or m 2 /s in SI units and cm 2 /s in CGS units.

Nov 26, 2025 · Diffusivity is a foundational process underpinning physiological functions, especially transport across biological membranes. A common example is gas exchange in the lungs, where …

Diffusivity, including thermal diffusivity, mass diffusivity, momentum diffusivity and magnetic diffusivity, refers to the ability of particles and heat to diffuse spontaneously to make the system uniform and …

Nov 20, 2025 · The characteristic property that determines this speed is called diffusivity—i.e., the ability of a molecule to diffuse through a sea of other molecules. Diffusivities in solids are extremely small, …

Jul 27, 2025 · Diffusivity, also known as the diffusion coefficient, quantifies the rate at which particles spread or mix within a medium. It represents the proportionality constant between the molar flux due …

Oct 14, 2025 · Mass diffusivity is the diffusion of particles through a medium, while thermal diffusivity is the diffusion of heat through a substance. Both are transport phenomena, but one involves mass …

diffusivity noun dif· fu· siv· i· ty də̇ˌfyüˌsivətē -ˈzi- sometimes (ˌ)dēˌ- plural -es

Diffusivity is typically represented by the symbol 'D' and is measured in units of area per time, such as m²/s. Higher diffusivity values indicate that a substance can spread more quickly through another …

Diffusivity, mass diffusivity or diffusion coefficient is usually written as the proportionality constant between the molar flux due to molecular diffusion and the negative value of the gradient in the …

Jan 1, 2016 · Diffusivity is easily quantified by the diffusivity flux, i.e., by how much a species diffuses per unit area per unit time. There are various practical situations which for different reasons, both …