I have an airtight rigid chamber of volume V (~500 cu.ft.)
I want to remove the air from the chamber such that the internal pressure is equivalent to some P absolute atmospheric pressure (eg 3.46psia)
I would want to evacuate the chamber from ambient pressure A (eg 14psia) to P within T milliseconds (< 1 second)
How would I go about determining the specs for the vacuum pump needed to perform this function? Assume ambient pressure is "on land" and the output of the vacuum is wide open into the environment (minimal resistance).