9. The following mechanism contributes very little the diffusivity. a)Vacancy, b)Interstitial, c)Substitutional, d)Self-diffusion. 10. In Fick's first law the concentration is change with respect to...

Extracted text: 9. The following mechanism contributes very little the diffusivity. a)Vacancy, b)Interstitial, c)Substitutional, d)Self-diffusion. 10. In Fick's first law the concentration is change with respect to ----in арасе. 11. In the case of steel hardening by Carburization carbon permit to diffuse into iron by ------ 12. Diffusion is driven by --- and