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Difference in vacuum and absolute vacuum?

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Answer:

There are several units of measure to use while dealing with vacuum.
The absolute units start from full vacuum then approach atmospheric pressure.
The "Gauge" ones use atmospheric pressure as a baseline- but Atm. Pressure varies with each day, with altitude, temperature and even with Hurricanes.
Some absolute units are: Torr, Millitorr, Mbar
Some "Gauge" units are: "Hg, Psig, "H20 (inches of water)

For more info see:
http://en.wikipedia.org/wiki/Pressure_measurement

First answer by ID1109423280. Last edit by ID1109423280. Question popularity: 1 [recommend question].

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