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a common manometer is a u-tube with a liquid filled about half way in each leg, one end is open to the atmosphere and the other connected to the thing that your measuring the pressure of, as the pressure increases, the liquid in the leg attached to your pressure of interest is forced down, and the pressure in the other leg is pushed up, because you are comparing it to the atmosphere it is a gauge pressure in comparison to the atmosphere =] hope this helps.

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