Diffusion Coefficient Converters
Convert diffusion coefficient (diffusivity) units used in mass transfer, membranes, gases, and liquids.
Explanation
The diffusion coefficient (diffusivity) is an area-per-time quantity (L²/T) used in Fick's laws, mass transfer modeling, membrane transport, and gas/liquid diffusion analysis. This hub anchors all factors to m²/s so SI and lab-scale units remain consistent and reversible. cm²/s is still common in older and experimental literature, while m²/s is the SI form. All conversions here are purely multiplicative.
Diffusion Coefficient pages are organized by conversion direction so mirror leaves remain aligned and comparable.
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Frequently Asked Questions
What is diffusion coefficient (diffusivity)?
The diffusion coefficient quantifies how quickly species spread by molecular diffusion and has dimensions of area per time (L²/T).
What is the SI unit of diffusivity?
The SI unit is square meter per second (m²/s).
Why is cm²/s common in lab tables?
Many experimental and older references report diffusivity in cm²/s, so it remains widely used in literature.
Why are diffusion values often very small?
Molecular diffusion in liquids and membranes is typically slow, so values often appear as small magnitudes like 1e-9 m²/s.
Are these conversions purely multiplicative?
Yes. All conversions in this hub are fixed multiplicative scale changes with no offsets.