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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