Fick’s first law
describes concentration gradient driven diffusion flux.
symbols, variables and units
J：mol/(m²·s)；D：m²/s；c：mol/m³。
applicable conditions and boundaries
The scalar D corresponds to isotropic dilute solute diffusion; non-ideal systems require a chemical potential model.
formula source code
The following is a copyable LaTeX expression.
\mathbf J=-D\nabla c
Reference and Extended Learning
DoITPoMS · University of Cambridge ↗is organized according to model definition and assumptions. Please check actual conditions and original literature before engineering, research and clinical use.
Fick diffusiondiffusion