v = velocity (m/s, ft/s)
The default values below are for water with density of 1000 kg/m 3 .
The default values below are for water with density of 1.940 slugs .
Some common densities at atmospheric pressure:
The dynamic pressure in water with - temperature 20 o C - density 1000 kg/m 3 and velocity 5 m/s - can be calculated as
p d = 1/2 (1000 kg/m 3 ) (5 m/s) 2
= 12500 Pa
= 12.5 kPa
The dynamic pressure in a hurricane with air temperature 20 o C, density of air 1.2 kg/m 3 and wind speed 37 m/s can be calculated as
p d = 1/2 (1.2 kg/m 3 ) (37 m/s) 2
= 821 Pa (N/m 2 )
The force acting directly on a wall with area 10 m 2 can be calculated as
F = p d A
= (821 N/m 2 ) (10 m 2 )
= 8210 N
= 8.2 kN
- almost the weight of a small car.
Note! - the real force acting on the wall - or an other obstruction in the wind - is in general more complicated to calculate due to drag , turbulence and other effects.
The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
Calculate air curtains or air screens in open doorways used to keep acceptable indoor comfort in buildings.
The Beaufort description and observation scale for wind and wind speed.
Velocity plotted in time used diagram.
The velocity reduction method can be used when sizing air ducts.
Energy possessed by an object's motion is kinetic energy.
Pitot tubes can be used to measure fluid flow velocities by measuring the difference between static and dynamic pressure in the flow.
Dynamic pressure or velocity head.
Wind load on surface - Wind load calculator.
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