Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Diffusion Coefficients

A substance will flow from a region of high concentration to a region of low concentration

Sponsored Links

Fick's first law states that a substance will flow from region with high concentration to a region of low concentration. Fick's law can be expressed as

J = -D dφ / dx                                  (1)

where

J = diffusion flux - the amount of substance that flows through an unit area per unit time (mass or mol /m2s)

D = diffusion coefficient (m2/s)

dφ = concentration of substance (mass or mol / m3)

dx = length (m)

Diffusion Coefficients for some common Gases

SubstanceDiffusion Coefficient
- D -
10-5 (cm2/s)
Methane - Water 1.5
Ethane - Water 1.1
Air - Water 1.9

 

Sponsored Links

Related Topics

Related Documents

Tag Search

  • en: diffusion coefficients ficks law
Sponsored Links

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate this page to
About the Engineering ToolBox!
.

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

1 15

Sponsored Links