What is the reason for the instant loss of a vaccum through the sealed glass tube after shuting off a pump?

Asked Sep 15 '15 at 07:02

Active Sep 15 '15 at 07:44

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A pump is connected to a glass tube to evacuate it. The reading shows 0.4 mbar when the pump is on because of a vacuum. As soon as the pump is turned off, the pressure in the tube becomes equal to atmospheric pressure.

edited Sep 15 '15 at 07:44

Fred

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asked Sep 15 '15 at 07:02

Rahul

What is the reason for the instant loss of a vaccum through the sealed glass tube after shuting off a pump?

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