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Thermal transpiration : ウィキペディア英語版
Thermal transpiration

Thermal transpiration or thermal diffusion refers to the thermal force on a gas due to a temperature difference. Thermal transpiration causes a flow of gas in the absence of any pressure difference, and is able to maintain a certain pressure difference (called thermomolecular pressure difference) in a steady state. The effect is strongest when the mean free path of the gas molecules is comparable to the dimensions of the gas container.
Thermal transpiration appears as an important correction in the readings of vapor pressure thermometers, and the effect is historically famous as being an explanation for the rotation of the Crookes radiometer.〔"On certain dimensional properties of matter in the gaseous state" Osborne Reynolds, Royal Society Phil. Trans., Part 2, (1879)〕〔"On stresses in rarefied gases arising from inequalities of temperature" James Clerk Maxwell, Royal Society Phil. Trans. (1879)〕
==See also==

*Thermophoresis (Soret effect) — diffusion of colloidal particles in a liquid, induced by a temperature gradient.

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