Good question. Most pressure gauges used by us common people (and not research scientists) are adjusted so they read Zero pressure when sitting on the bench disconnected. (or on a line with no pressure in it, like a oxygen gauge on a Oxy/acetylene torch with it blead out to be put away) This means that the gauge is compensating for the atmospheric pressure of 14.7 PSI to show Zero. That gauge, put into a vacuum chamber, would try to move CCW below the zero. Jim
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