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Which one is having the highest value of diffusivity?

(a) Water

(b) Oxygen

(c) Hydrogen

(d) Carbon dioxide

I got this question in final exam.

Question is from Diffusivity at 25 Degree Celsius and 1 atm Pressure topic in section Modes and Diffusion of Mass Transfer

1 Answer

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by (39.8k points)
Right option is (a) Water

For explanation: Thermal diffusivity of water is 0.256 while that of oxygen, hydrogen and carbon dioxide are 0.206, 0.210 and 0.164 respectively. Its unit is cm^2/s.

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