how to fan gives us air as pressure
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Air is a gas, but for purposes of calculating atmospheric pressure, you could regard it as a fluid, and calculate the pressure at sea level using the expression for fluid pressure. This expression is P = ∂gh, where ∂ is the density of air, g is the acceleration of gravity, and h is the height of the atmosphere.
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Fan static pressure is one of the two parameters that define the performance of a fan. The other, and more common, is the volume of air the fan delivers per minute or per hour. Fan static pressure is the resistance pressure the fan has to blow against to move air in the desired direction........
If you add energy to the air with a fan you can increase both its speed and pressure. As the air encounters resistance from the tube walls (and turbulence) some of its energy will be lost and thus the pressure will drop as a result. ... Well, according to Bernoulli, the faster a fluid flows, the lower the pressure........
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