# Critical Velocity | Definition, Formula, Units – Hydrodynamics

Critical Velocity Definition:
The critical velocity is the velocity of liquid flow, below which its flow is streamlined and above which it becomes turbulent.

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## Critical Velocity | Definition, Formula, Units – Hydrodynamics

Formula of Critical Velocity:

Critical velocity, vc = $$\frac{K \eta}{r \rho}$$

where,
K = Reynold’s number,
η = coefficient of viscosity of liquid,
r = radius of capillary tube and
ρ = density of the liquid.

Critical Velocity Dimensional Formula:

Vc = M0L1T-1

Unit of Critical Velocity:
SI unit of Critical Velocity is meter/sec

Hydrodynamics:
In physics, hydrodynamics of fluid dynamics explains the mechanism of fluid such as flow of liquids and gases. It has a wide range of applications such as evaluating forces and momentum on aircraft, prediction of weather, etc.