Dynamic Pressure

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Dynamic pressure is a defined property of a moving flow of gas or liquid and can be expressed as

p_d = 1/2 ρ v²         (1)

where

p_d = dynamic pressure (Pa)

ρ = density of fluid (kg/m³)

v = velocity (m/s)

Dynamic Pressure Calculator

The calculator below can be used to calculate the dynamic pressure generated by a moving fluid. The calculator is generic and both SI and Imperial units can be used.

The default values below are for water with density of 1000 kg/m³.

Some common densities at atmospheric pressure:

• Water - 0^oC - 1000 kg/m³
• Water - 32^oF - 62.4 lb_m/ft³
• Air - 20^oC - 1.2 kg/m³
• Air - 59^oF - 0.0765 lb_m/ft³

Example - Dynamic Viscosity in Water Flow

The dynamic pressure of water at temperature 20^oC and density 1000 kg/m³, flowing with a velocity of 5 m/s, can be calculated like

 p_d = 1/2 (1000 kg/m³)(5 m/s)²

    = 12.5 kPa

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• Fluid Mechanics - The study of fluids - liquids and gases. Involves various properties of the fluid, such as velocity, pressure, density and temperature, as functions of space and time.

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