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Explain in one sentence why diffusion can take
place in a solid, that consists of a lattice packed with atoms?
The composition of a material that has different concentrations of impurities
in different parts of it will change with time, because of diffusion. The
composition of a pure substance does not change in time. Does diffusion
occur in such pure solid?
"Diffusivity" is defined by Fick's first law. Write down this law, define
all its symbols, and deduce the S.I units for diffusivity.
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