Dynamic pressure is a defined property of a moving flow of gas or liquid and can be expressed as
pd = 1/2 ρ v2 (1)
pd = dynamic pressure (Pa)
ρ = density of fluid (kg/m3)
v = velocity (m/s)
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 - 0oC - 1000 kg/m3
- Water - 32oF - 62.4 lbm/ft3
- Air - 20oC - 1.2 kg/m3
- Air - 59oF - 0.0765 lbm/ft3
The dynamic pressure of water at temperature 20oC and density 1000 kg/m3, flowing with a velocity of 5 m/s, can be calculated like
pd = 1/2 (1000 kg/m3)(5 m/s)2
= 12.5 kPa