Q. The Reynolds number is the ratio of:

रेनॉल्ड्स संख्या का अनुपात है:

Inertial forces to gravitational forces
जड़त्वीय बल से गुरुत्वाकर्षण बल तक

Viscous forces to inertial forces
श्यान बल से जड़त्व बल तक

Inertial forces to viscous forces
जड़त्वीय बल से श्यान बल

Gravitational forces to viscous forces
गुरुत्वाकर्षण बल से श्यान बल

Reynolds number (Re) = $\frac{Inertial force}{Viscous force}$

R e = \frac{ρ v L}{μ}

It helps predict flow regimes:

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