Discuss the below:
Q: The Stokes number, St, used in particle-dynamics studies, is a dimensionless combination of five variables: acceleration of gravity g, viscosity µ, density, particle velocity U, and particle diameter D.
(a) If St is proportional to µ and inversely proportional to g, find its form.
(b) Show that St is actually the quotient of two more traditional dimensionless groups.