The number of particles given by \[n=-D\left(\frac{n_{2}-n_{1}}{x_{2}-x_{1}}\right)\] are crossi...

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The number of particles given by
\[n=-D\left(\frac{n_{2}-n_{1}}{x_{2}-x_{1}}\right)\]
are crossing a unit area perpendicular to \( x \)-axis in unit time. \( n_{1}, n_{2} \) are number of particles per unit volume, for the values of \( x \) meant to be \( x_{1} \) and \( x_{2} \). What is the dimensional formula of diffusion constant D ?
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