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1) True or false? : The driving force for unsteady state diffusion is a constant mass...

1) True or false? : The driving force for unsteady state diffusion is a constant mass concentration gradient.

2) True of false? Carbon diffuses faster in Cu than in iron.

Engineering   Mechanical-Engineering   
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Answer #1

1)False

In unsteady state of mass diffusion due to turbulent mixing the mass consentration at a particular point changes with time,this in turn changes the diffusion flux with time.So statement is false.

2)False

For Solid state diffusion size is the most important factor,and in case of interstitial diffusion the interatomic spacing is most important in which an interstitial atom fits.In case of C and Fe the interstitial spacing of the Fe lattice is nearly of same size of the carbon atom so diffusion in Fe lattice is much easier.This is not the case with Cu lattice.

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