Number of particles is given by \( n=-D \frac{n_{2}-n_{1}}{x_{2}-x_{1}} \) crossing a unit area ...

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