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manometer

To calculate pressure in a U-tube manometer, add the sum of the readings above and below zero. This diagram shows an atmospheric reading of 4. (Precision Graphics)

n.

1. An instrument used for measuring the pressure of liquids and gases.
2. A sphygmomanometer.

[Greek manos, sparse + –METER.]

manometric man'o·met'ric (măn'ə-mĕt'rĭk) or man'o·met'ri·cal adj.
manometrically man'o·met'ri·cal·ly adv.
manometry ma·nom'e·try n.

A double-leg liquid-column gage used to measure the difference between two fluid pressures. Micromanometers are precision instruments which typically measure from very low pressures to 50 mm of mercury (6.7 kilopascals). The barometer is a special case of manometer with one pressure at zero absolute. See also Barometer.

The various types of manometers have much in common with the U-tube manometer, which consists of a hollow tube, usually glass, a liquid partially filling the tube, and a scale to measure the height of one liquid surface with respect to the other (see illustration). If the legs of this manometer are connected to separate sources of pressure, the liquid will rise in the leg with the lower pressure and drop in the other leg. The difference between the levels is a function of the applied pressure and the specific gravity of the pressurizing and fill fluids.

U-tube manometer.

A well-type manometer has one leg with a relatively small diameter, and the second leg is a reservoir. The cross-sectional area of the reservoir may be as much as 1500 times that of the vertical leg, so that the level of the reservoir does not change appreciably with a change of pressure. Mercurial barometers are commonly made as well-type manometers.

The inclined-tube manometer is used for gage pressures below 10 in. (250 mm) of water differential. The leg of the well-type manometer is inclined from the vertical to elongate the scale. Inclined double-leg U-tube manometers are also used to measure very low differential pressures. See also Pressure measurement.

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n

A device for measuring the pressure of a fluid, consisting of a tube marked with a scale and containing a relatively incompressible fluid, such as mercury. The level of the fluid in the tube varies directly with the pressure of the fluid being measured. Manometers are used to measure blood pressure.

An instrument for the measurement of pressure; a U-shaped glass tube partially filled with water or mercury, one side of which is connected to the source of pressure. The amount of displacement of the liquid is a measure of the magnitude of the pressure.

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A device for measuring the pressure of a fluid.

An instrument for ascertaining the pressure of gases or liquids, particularly blood pressure. See also sphygmomanometer.

• aneroid m. — provides direct measurement of mean arterial blood pressure through a catheter placed in a peripheral artery.

Dansk (Danish)
n. - manometer, trykmåler

Nederlands (Dutch)
manometer (gasdrukmeter/ bloeddrukmeter)

Français (French)
n. - manomètre

Deutsch (German)
n. - Manometer

Ελληνική (Greek)
n. - θλιβόμετρο, πιεσόμετρο, μανόμετρο

Italiano (Italian)
manometro

Português (Portuguese)
n. - manômetro (m)

Русский (Russian)
манометр

Español (Spanish)
n. - manómetro

Svenska (Swedish)
n. - manometer

中文（简体） (Chinese (Simplified))
压力计

中文（繁體） (Chinese (Traditional))
n. - 壓力計

한국어 (Korean)
n. - 혈압계, 압력계

日本語 (Japanese)
n. - 圧力計, 血圧計, 液柱圧力計

العربيه (Arabic)
‏(الاسم) أبخرة غازيه‏

עברית (Hebrew)
n. - ‮מד-לחץ לנוזלים ולגזים, מנומטר‬

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Manometer 300 Mmhg