manometer

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ma·nom·e·ter / məˈnämətər/ • n. an instrument for measuring the pressure acting on a column of fluid, esp. one with a U-shaped tube of liquid in which a difference in the pressures acting in the two arms of the tube causes the liquid to reach different heights in the two arms. DERIVATIVES: man·o·met·ric / ˌmanəˈmetrik/ adj. man·o·met·ri·cal·ly / ˌmanəˈmetrik(ə)lē/ adv. ma·nom·e·try / -trē/ n.

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manometer A device for measuring pressure differences, usually by the difference in height of two liquid columns. The simplest type is the U-tube manometer, which consists of a glass tube bent into the shape of a U. If a pressure to be measured is fed to one side of the U-tube and the other is open to the atmosphere, the difference in level of the liquid in the two limbs gives a measure of the unknown pressure.

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manometry (mă-nom-itri) n. measurement of pressures within organs of the body. The technique is used to record changes within fluid-filled chambers (e.g. cerebral ventricles) or to indicate muscular activity in motile tubes, such as the oesophagus, rectum, or bile duct.

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manometer An instrument that can be used for the direct measurement of vacuum, positive pressure, and differential pressure. It usually consists of two interconnected tubes filled with fluid, e.g. water or mercury. A difference in fluid levels in the two tubes records the pressure. It can also be modified to measure flow.

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manometer (mă-nom-it-er) n. a device for measuring pressure in a liquid or gas. See also sphygmomanometer.

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manometer XVIII. — F. manomètre, f. Gr. manós thin, rare; see -METER.