What is the effect of pressure,humidity
and density on the velocity of sound in air

c=γPρspeed is directly proportional to the root of pressure.inversely proportional to root of density.as humidity increases the gamma increases hence the velocity increases

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A number of factors (altitude/pressuretemperature, and humidity) influence air density. A higher altitude, low-pressure area, higher temperature and high humidity all have one result: they lower the density of the air. And as a result of that: a reduction in aircraft and engine performance.
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