Thermal transpiration

Diagram showing pressure difference induced by a temperature difference.

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.

单词	Thermal effusion
释义	Thermal effusion 英语百科 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.
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Thermal effusion

Thermal transpiration