η Your Turn 5c a. Work out the dimensions of n from the Stokes formula. Show that they can be regarded as those of pressure times time, and that hence the SI unit for viscosity is Pa · s. b. Your Turn 5a raised a paradox: Our equilibrium formula suggested that milk should separate, and yet we don't normally observe this happening. Use the Stokes formula to estimate how fast this should happen in homogenized milk. Then compare the situation in raw milk, whose fat droplets are over 5 μm in diameter, and comment.