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I have the following situation: I have a closed container with a certain gas at a certain temperature(Tg) and pressure(pg). Now I open the container. The gas will escape through the opening to the atmosphere in order to create a pressure balance. There will be no significant increse in the pressure in the atmosphere but there will be noticible pressrue drop in the container. Does anyone know the formula to calculate the change in pressure over time in the container? Thanks in advance for any kind of help.

With Regards,

sk