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  1. Rattletraped

    Calculation pressure loss rate

    Thanks all, I will have a go at the suggestions. All make sense to me now. I am also building a testing apparatus to compare theory against a physical test. Thanks, Stan
  2. Rattletraped

    Calculation pressure loss rate

    Hi Israelk The ambient is changing from 1 atmosphere to a vacuum of about 20 kPa. So by saying ambient, in this case it is the ambient that is changing. The chamber needs to follow. That is from 101 kPa to 20 Kpa. so the chamber have the original pressure that is the 101 Kpa inside of it if...

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