question_answer

Although the velocity of air molecules is nearly \[\mathbf{0}\mathbf{.5 km }{{\mathbf{s}}^{\mathbf{-1}}}\], yet the smell of scent spreads at a much slower rate. Why?

Answer:

                The air molecules travel along a zig-zag path due to frequent collisions. As a result, their displacement per unit time is very small. Hence the smell of scent spreads very slowly.