Creating a Temporary Vacuum: Is it Possible?

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Creating a temporary vacuum around an object is theoretically possible, but the speed at which air can replace the vacuum is limited by the speed of sound. If the object is not enclosed, air will rush in almost immediately, negating the vacuum effect. The discussion also touches on supercavitation phenomena, suggesting that a vacuum could be maintained under specific conditions. Additionally, the acceleration of the object would influence airflow dynamics, potentially affecting how quickly air fills the vacuum. Understanding these principles is crucial for applications in aerodynamics and fluid dynamics.
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If you were to destroy all the air around an object, would that give you a temporary vacuum or would the air be replaced so quickly that it wouldn't make a difference?
 
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Is the object inside an enclosure? If not, air would come in immediately.
 
Well it couldn't come in faster than the speed of sound.

Something pretty similair happens to make thunder
 
mathman said:
Is the object inside an enclosure? If not, air would come in immediately.

No, the object is not inside an enclosure. I was thinking of any type of sealed object traveling through the sky.
 
mgb_phys said:
Well it couldn't come in faster than the speed of sound.
Are you certain that this is true? Could you explain the logic please? So then a supercavitation type of phenomenon would be possible but with a vacuum.
mgb_phys said:
Something pretty similair happens to make thunder
Would you mind elaborating please. Thanks
 
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Also, let's say that the object has acceleration. I know this would affect the airflow but how?
 

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