Mass diffusivity, often represented by the symbol \( D \), is a measure of how quickly and effectively particles (such as atoms, molecules, or ions) move from regions of higher concentration to regions of lower concentration within a medium. It is a fundamental property in the study of diffusion processes and is essential in various fields such as chemistry, physics, biology, and engineering. The diffusivity is typically expressed in units of area per unit time (e.g., \( m^2/s \)).
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Mass diffusivity is the coefficient multiplying the Laplacian in a diffusion law for a concentration or density anomaly.