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Anonymous File :-(, x)
>>421420 >>421423 actually they aren't necessarily
>>421431 since a vacuum by definition involves low pressure, the two are interrelated.
>>421426 Generally speaking yes, but it DOES NOT have to take place at a supersonic speed. It occurs when airflow over a part of the wing is supersonic and still subsonic at other parts (also referred to as transonic), which (by design of a wing) occurs before the speed of the whole plane is supersonic. The vapor occurs when the local pressure drops suddenly and depresses the air temperature below the dewpoint, essentially forming a cloud. It's referred to scientifically as the Prandtl-Glauert singularity.
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