1. Now let's consider what they might depend on. Since what is controlling both of them are the molecules of the fluid colliding with each other, here are some parameters it might depend on:

• the mass density of the fluid ()
• the average speed of the molecules of the fluid (v₀)
• how far the molecules travel between collisions (the mean free path, ).

If we only are going to use these three parameters, find combinations of these three parameters that give you the correct dimensionality forandD.

2. From the dimensionality of each, construct a plausible relation between and D (i.e., an equation relating and D).