old man emu Posted November 7, 2020 Share Posted November 7, 2020 2 hours ago, facthunter said: A vacuum is Essentially a place devoid of matter. Hard to achieve but there's no little vacuums and bigger ones OK. I agree that a true vacuum is a place, be it a bounded by walls, as in a light bulb, or outside the boundaries of astronomical bodies. Your definition is a little bit like being pregnant - you are, or you are not. Link to comment Share on other sites More sharing options...
M61A1 Posted November 7, 2020 Share Posted November 7, 2020 Doesn't anyone have some flying to do? Link to comment Share on other sites More sharing options...
facthunter Posted November 7, 2020 Share Posted November 7, 2020 OME you can't have fractions or multiples of infinity either. A vacuum is when there's.... Nothing... Getting back to the measurement of pressure a bourdon tube is a hollow curved flat sectioned spring and it's straightening is independent of external pressure. One good thing going for the engine at higher levels is there's less pressure opposing the exit of the exhaust gases. Normally that's included in "Pumping Losses" of an engines operation but would be a variable back pressure. Nev Link to comment Share on other sites More sharing options...
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