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When a given gas has a temperature gradient, the aerosol particles move from higher temperature regions to low temperature regions. This effect is known as __________

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When a given gas has a temperature gradient, the aerosol particles move from higher temperature regions to low temperature regions. This effect is known as __________

(a) Photophoresis

(b) Diffusiophoresis

(c) Thermophoresis

(d) Diffusiophoresis or Thermophoresis

I had been asked this question in exam.

The above asked question is from Aerosols topic in section Particulates, Acid Rain & Aerosols of Environmental Engineering

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The correct choice is (c) Thermophoresis

To explain: Based on the temperature gradient, by the effect of thermophoresis, aerosol particles move from high temperature regions to low temperature regions.

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