# Dynamic Pressure

## Dynamic pressure is the component of fluid pressure representing the fluid kinetic energy

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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 v^{2}(1)

where

p_{d }= dynamic pressure (Pa)

ρ = density of fluid (kg/m^{3})

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/m ^{3}*.

Some common densities at atmospheric pressure:

- Water -
0^{o}C - 1000 kg/m^{3}- Water -
32^{o}F - 62.4 lb_{m}/ft^{3}- Air -
20^{o}C - 1.2 kg/m^{3}- Air -
59^{o}F - 0.0765 lb_{m}/ft^{3}

### Example - Dynamic Viscosity in Water Flow

The dynamic pressure of water at temperature *20 ^{o}C* and density

*1000 kg/m*, flowing with a velocity of

^{3}*5 m/s*, can be calculated like

p_{d}= 1/2 (1000 kg/m^{3}) (5 m/s)^{2}

= 12.5 kPa

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