Define the dimensions of the following groups: where p is the pressure, D is the diameter of a pipe, µ, is the dynamic viscosity, Q is the discharge, T is the torque, p is the fluid density, N is the...

Define the dimensions of the following groups:

where p is the pressure, D is the diameter of a pipe, µ, is the dynamic viscosity, Q is the discharge, T is the torque, p is the fluid density, N is the speed in rpm, P is the power, His the head of water, V is the velocity, L is a characteristic length, and
 is the surface tension.