Various experimental techniques are employed to determine diffusion coefficients. However,the results obtained using either approach are not precise. If we aspire to obtain a higher degree of precision is necessary, an experimental procedure is to be employed. The Wiener's process, light beam deflection techniques, decaying pulse technique, quasi-steady-state diffusion via a porous diaphragm, and interferometry are all the major experimental approaches that one can employ for assessing the mass diffusivity of a given species experimentally.