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manometer (muh-NOM-ee-tuhr) - n., an instrument for measuring the pressure of liquids or gasses consisting of a U-shaped glass tube partially filled with a fluid, which is displaced by an amount proportional to the pressure exerted.
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Thanks, American Heritage Dictionary
Can be used in for any pressure gauge, though you probably want to distinguish between a manometer and a barometer -- the former measures pressure relative to atmospheric pressure, while the latter measures that atmospheric pressure. The liquid, FWIW, is typically water or mercury. Adopted in 1730 from French manomètre, which was coined in 1706 by French mathematician Pierre Varignon manos, thin/rare + meter, measure -- by which you can tell he was especially interested in measuring vacuums.
---L.
Like this:

Thanks, American Heritage Dictionary
Can be used in for any pressure gauge, though you probably want to distinguish between a manometer and a barometer -- the former measures pressure relative to atmospheric pressure, while the latter measures that atmospheric pressure. The liquid, FWIW, is typically water or mercury. Adopted in 1730 from French manomètre, which was coined in 1706 by French mathematician Pierre Varignon manos, thin/rare + meter, measure -- by which you can tell he was especially interested in measuring vacuums.
---L.