Froude number ($Fr$) is a dimensionless parameter defined as the square root of the ratio of inertia force to gravity force:
$$Fr = \sqrt{\frac{\text{Inertia Force}}{\text{Gravity Force}}} = \frac{V}{\sqrt{g D}}$$Where $V$ is flow velocity, $g$ is acceleration due to gravity, and $D$ is hydraulic depth. It governs open channel flow regimes (subcritical $Fr \lt 1$, critical $Fr = 1$, supercritical $Fr \gt 1$). Reynolds number is inertia force to viscous force; Mach number is inertia force to elastic force; Euler number is inertia force to pressure force.
फ्राउड संख्या (Froude number) को जड़त्व बल (inertia force) और गुरुत्वाकर्षण बल (gravity force) के अनुपात के वर्गमूल के रूप में परिभाषित किया जाता है।