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The number of particles is given by n = ...

The number of particles is given by `n = -D(n_(2) - n_(1))/( x_(2) - x_(1))` crossing a unit area perpendicular to X - axis in unit time , where `n_(1)and n_(2)` are particles per unit volume for the value of `x` meant to `x_(2) and x_(1)` . Find the dimensions of `D` called diffusion constant.

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`[D]=(["Volume" xx "Length"])/([L^(2)T])=([L^(4)])/([L^(2)T])=[L^(2)T^(-1)]`
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