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Molecular diffusion is which type of motion?

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Molecular diffusion is which type of motion?

(a) Thermal motion

(b) Linear motion

(c) Non- turbulent motion

(d) Rectilinear motion

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This interesting question is from Molecular Diffusion in portion Mass Transfer of Bioprocess Engineering

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The correct option is (a) Thermal motion

Easy explanation: Molecular diffusion, often simply called diffusion, is the thermal motion of all (liquid or gas) particles at temperatures above absolute zero. The rate of this movement is a function of temperature, viscosity of the fluid and the size (mass) of the particles.

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