Prove that the following ratios are dimensionless: where V is the velocity, y is the flow depth, v is the kinematic viscosity, p is the fluid density, µ, is the dynamic viscosity, p is the pressure,...

Prove that the following ratios are dimensionless:

where V is the velocity, y is the flow depth, v is the kinematic viscosity, p is the fluid density, µ, is the dynamic viscosity, p is the pressure, -y is the specific weight,
 is the surface tension, and Q is the discharge.