Diffusion velocity

diffusion velocity

1. The relative mean molecular velocity of a selected gas undergoing diffusion in a gaseous atmosphere, commonly taken as a nitrogen (N₂) atmosphere.

   
   

   The diffusion velocity is a molecular phenomenon and depends upon the gaseous concentration as well as upon the pressure and temperature gradients present.

   
   
2. The speed with which a turbulent diffusion process proceeds as evidenced by the motion of individual eddies.

   
   
   Lettau, H. 1951. Compendium of Meteorology. 320–321.
   
   

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1. A gaseous envelope gravitationally bound to a celestial body (e.g., a planet, its satellite, or a star).