Thermal diffusion may refer to:
- A thermal force on a gas due to a temperature gradient, also called thermal diffusion or Thermal transpiration.
- It is used to drive a gas pump with no moving parts called a Knudsen pump.
- It is the currently accepted theory for the rotation of the Crookes radiometer.
- Diffusion in a temperature gradient, also called thermodiffusion or thermophoresis.
- It can be used as an obsolete method of making enriched uranium (see enriched uranium § thermal diffusion).
- Thermal diffusion can be used to measure fluid flow, including perfusion and rCBF at one location over time.
- Brownian motion (at a constant non-zero absolute temperature ).
See also:
- Molecular diffusion
- Heat conduction (i.e., diffusion of heat)
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