vacuum question

**dizam** · Nov26-09, 07:06 AM

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?

**mathman** · Nov26-09, 07:42 PM

Is the object inside an enclosure? If not, air would come in immediately.

**mgb_phys** · Nov26-09, 09:14 PM

Well it couldn't come in faster than the speed of sound.

Something pretty similair happens to make thunder

**dizam** · Nov27-09, 05:15 AM

Originally Posted by mathman

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.

**dizam** · Nov27-09, 05:18 AM

Originally Posted by mgb_phys

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.

Originally Posted by mgb_phys

Something pretty similair happens to make thunder

Would you mind elaborating please. Thanks

**dizam** · Nov27-09, 05:21 AM

Also, lets say that the object has acceleration. I know this would affect the airflow but how?