The equation below is sometimes called Einstein-Smoluchowski and describes the estimated time between collisions for molecular diffusion. Where t is time, x is distance and DAB is the diffusion coefficient. t=2DABx2 Use this equation to estimate how long a particle would travel in 1 min in gas phase assuming typical gas diffusion coefficient of 0.1cm2/s \begin{tabular}{l} \hline 3.46cm \\ \hline 0.47cm \\ \hline 12cm \\ \hline 0.2 \end{tabular}