# Fick's Law of Diffusion

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**Formula:**`J = -D(A/L)dC/dx`

## Introduction to Fick's Law of Diffusion

Fick's law of diffusion describes the process of diffusion through a stationary medium, such as a fluid or a solid matrix. The formula represents the steady state one-dimensional diffusion of a solute in a medium. It calculates the flux of the solute across a unit area per unit time. In this formula, ** J** represents the flux,

**is the diffusion coefficient,**

*D***is the surface area through which diffusion is taking place,**

*A***is the distance over which diffusion is occurring, and**

*L***is the concentration gradient.**

*dC/dx*## Parameter usage:

`diffusionCoefficient`

= diffusion coefficient of the solute in the medium`surfaceArea`

= surface area through which diffusion is taking place`concentrationGradient`

= concentration gradient across the distance of diffusion

## Output:

`flux`

= flux of the solute across the area

## Data validation

The diffusion coefficient, surface area, and concentration gradient should be greater than zero.

## Summary

This calculator allows for the determination of the flux of solute across a unit area per unit time in a medium due to diffusion.