Dimensionless Numbers in Hydraulics and Fluid Mechanics – The important dimensionless numbers are Reynold’s number, Froude’s number, Weber’s number, Euler’s number and Mach’s number:

** (a) Reynold’s number:** It is the ratio of the inertia force to the viscous force.

** (b) Froude’s number:** It is the ratio of the inertia force to the gravity force.

** (c) Weber’s number:** It is the ratio of the inertia force to the surface tension force.

** (d) Euler’s number:** It is the ratio of the inertia force to the pressure force.

** (e) Mach’s number or Cauchy’s number:** It is the ratio of the inertia force to the elastic force.

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