Fick’s Law of Diffusion Calculator

Calculates relative diffusion rate from area, diffusion coefficient, pressure gradient, and membrane thickness.

Inputs

Color mode links each input to the matching equation term and solving arithmetic.

Equation and Work

Equation:
Solving steps:
Relative diffusion
—
rate units
A×D×ΔP
—
numerator
Thickness
—
inverse effect

Clinical Significance

Relative diffusion rate from area, diffusion coefficient, pressure gradient, and membrane thickness.

This calculator expands that idea by identifying the relevant measured values, substituting the selected inputs, and carrying the arithmetic through in the solving steps.

Illustrates that diffusion rises with surface area, gas diffusion coefficient, and pressure gradient, and falls as membrane thickness increases.

This is a conceptual/proportional calculation, not a direct DLCO measurement.

References (APA 7th Edition)

  1. Chang, D. W. (2020). Respiratory Care Calculations (Revised 4th ed.). Jones & Bartlett Learning. Formula content adapted from the uploaded text/reference packet.