The square root of the ratio of inertia force to the pressure force is called as Euler’s ratio.

Eu  =  √ Inertia force / Pressure force  =  √ Mass x Acceleration / Pressure x Area

= √ ρ. V. V / T           V / T =   Q = V.A

=  √ ρ. V². A / P.A  = √ ρV² / P

E_u  =   V / √ P/ ρ

In caviatation study wher pressure force is predominant.

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