336320
Diffusion is obvious
\[\begin{array}{l}
\begin{array}{*{20}{c}}
{{\rm{i}}{\rm{.}}\;{\rm{In}}\;{\rm{gases}}\;\;}&{\;\;\;\;}&{{\rm{ii}}{\rm{.}}\;{\rm{In}}\;{\rm{liquids}}}
\end{array}\\
\begin{array}{*{20}{c}}
{{\rm{iii}}{\rm{.}}\;{\rm{In}}\;{\rm{solids}}}&{\;\;\;\;}&{{\rm{iv}}{\rm{.}}\;{\rm{Of}}\;{\rm{solids}}}
\end{array}
\end{array}\]
336320
Diffusion is obvious
\[\begin{array}{l}
\begin{array}{*{20}{c}}
{{\rm{i}}{\rm{.}}\;{\rm{In}}\;{\rm{gases}}\;\;}&{\;\;\;\;}&{{\rm{ii}}{\rm{.}}\;{\rm{In}}\;{\rm{liquids}}}
\end{array}\\
\begin{array}{*{20}{c}}
{{\rm{iii}}{\rm{.}}\;{\rm{In}}\;{\rm{solids}}}&{\;\;\;\;}&{{\rm{iv}}{\rm{.}}\;{\rm{Of}}\;{\rm{solids}}}
\end{array}
\end{array}\]
336320
Diffusion is obvious
\[\begin{array}{l}
\begin{array}{*{20}{c}}
{{\rm{i}}{\rm{.}}\;{\rm{In}}\;{\rm{gases}}\;\;}&{\;\;\;\;}&{{\rm{ii}}{\rm{.}}\;{\rm{In}}\;{\rm{liquids}}}
\end{array}\\
\begin{array}{*{20}{c}}
{{\rm{iii}}{\rm{.}}\;{\rm{In}}\;{\rm{solids}}}&{\;\;\;\;}&{{\rm{iv}}{\rm{.}}\;{\rm{Of}}\;{\rm{solids}}}
\end{array}
\end{array}\]
336320
Diffusion is obvious
\[\begin{array}{l}
\begin{array}{*{20}{c}}
{{\rm{i}}{\rm{.}}\;{\rm{In}}\;{\rm{gases}}\;\;}&{\;\;\;\;}&{{\rm{ii}}{\rm{.}}\;{\rm{In}}\;{\rm{liquids}}}
\end{array}\\
\begin{array}{*{20}{c}}
{{\rm{iii}}{\rm{.}}\;{\rm{In}}\;{\rm{solids}}}&{\;\;\;\;}&{{\rm{iv}}{\rm{.}}\;{\rm{Of}}\;{\rm{solids}}}
\end{array}
\end{array}\]