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Convection does not occur in _______________

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Convection does not occur in _______________

(a) Solid

(b) Liquid

(c) Gas

(d) Molten Solid

I had been asked this question during an online exam.

My enquiry is from Convective Mass Transfer topic in division Mass Transfer of Bioprocess Engineering

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Best answer
The correct option is (a) Solid

Explanation: Convection cannot take place in most solids because neither bulk current flows nor significant diffusion of matter can take place. Diffusion of heat takes place in rigid solids, but that is called heat conduction. Convection, however, can take place in soft solids or mixtures where solid particles can move past each other.

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