• This simulation from PhET shows two-gas diffusion with adjustable parameters.


Andrew Duffy of BU also has two simulations on this topic

  • Brownian Motion, with variable temperature

  • One or two-gas diffusion, also with variable temperature


  • This simulation by B. Surendranath traces the motion of a massive dust particle undergoing Broanian motion; the number and mass of the air molecules and their temperature can be adjusted.


  • On a related topic, this additional app by Andrew Duffy simulates diffusion-limited aggregation with variable attraction.