Question:

In a fluid flow, Mach number is an estimate of _________.

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The Mach number helps in determining whether the flow is compressible and is a key indicator for shock waves and flow speeds.
Updated On: Apr 10, 2025
  • \( \sqrt{\frac{{inertia force}}{{viscous force}}} \)
  • \( \sqrt{\frac{{inertia force}}{{elastic force}}} \)
  • \( \sqrt{\frac{{elastic force}}{{viscous force}}} \)
  • \( \sqrt{\frac{{viscous force}}{{inertia force}}} \)
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The Correct Option is B

Solution and Explanation

The Mach number (\( M \)) is a dimensionless number that represents the ratio of the velocity of the flow to the speed of sound in the medium. It is used to estimate the relationship between the inertia forces and elastic forces in a fluid flow. Hence, the correct expression for Mach number is: \[ M = \sqrt{\frac{{inertia force}}{{elastic force}}} \] This relationship helps determine the effects of compressibility and the transition between subsonic and supersonic flows.
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