Photophoresis

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This article is about the physical phenomenon photophoresis. For the medical treatment of blood see: photopheresis.

In physics, photophoresis is the phenomenon that intense light induces motion in particles suspended in a gas. The causes are generally distinct from radiation pressure.

Discovery is usually attributed to Felix Ehrenhaft though earlier observations were made by others including Augustin-Jean Fresnel.

See also: Crookes radiometer.

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