# manometer

## Definitions

• WordNet 3.6
• n manometer a pressure gauge for comparing pressures of a gas
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Webster's Revised Unabridged Dictionary
• n Manometer An instrument for measuring the tension or elastic force of gases, steam, etc., constructed usually on the principle of allowing the gas to exert its elastic force in raising a column of mercury in an open tube, or in compressing a portion of air or other gas in a closed tube with mercury or other liquid intervening, or in bending a metallic or other spring so as to set in motion an index; a pressure gauge. See Pressure, and Illust. of Air pump.
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Century Dictionary and Cyclopedia
• n manometer An instrument for determining and indicating the elastic pressure of gases or vapors. It measures the weight of a column of liquid or the tension of a spring that exactly balances the elastic pressure of the gas on a unit of area; and, since the relative density of a gas is proportional to its elastic pressure, the measurement of the latter determines also the former. Manometers which measure elastic gaseous pressure by the tension of a spring are used for steam-gages. In some forms the pressure of the gas is on a piston or diaphragm connected with a counterbalancing spring. In others the initial pressure is received on a small primary piston, or diaphragm, and transmitted by a fluid mass acting upon a secondary and much larger piston or diaphragm upon which the pressure per unit of area is reduced inversely as the area of the smaller piston is to that of the larger. Of this kind is Shaw's gage for measuring very high pressures. In the Bourdon steam-gage a curved tubular spring is used, having its interior connected by a tube with the interior of the tank, boiler, cylinder, or gasholder containing the vapor or gas to be tested. In all of these forms the parts moved under varying pressure are connected with an indicator, and the pressure is read on a graduated dial-plate. In the open-air manometer the elastic pressure of a gas is indicated by the height of a column of liquid, usually mercury or water, which it will support. In its simplest form an S-shaped glass tube, open at the upper end, is employed, as shown in the cut. In the compressed-air manometer the tube containing the liquid is closed at the top, and hence the varying elastic pressure of the confined air is added to the weight of the liquid column in balancing the gaseous pressure to be measured. The statical manometer of Boyle has a thin glass bulb counterpoised on a pair of delicate scales, the specific gravity of the bulb and its confined air varying with both pressure and temperature of the surronnding air. The manometer of Ramsden is essentially a compressed-air manometer combined with a scale which indicates temperatures while determining atmospheric density. The ordinary gas-gage is a simple open-air manometer.
• n manometer In physiology, an instrument used for determining blood-pressure.
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Chambers's Twentieth Century Dictionary
• n Manometer man-om′e-tėr an instrument for measuring the rarity or density of gases from their elastic force—also Man′oscope
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## Etymology

Webster's Revised Unabridged Dictionary
Gr. thin, rare + -meter,: cf. F. manomètre,
Chambers's Twentieth Century Dictionary
Gr. manos, rare, metron, measure.

## Usage

### In literature:

The manometer showed ten degrees.
"Twenty Thousand Leagues under the Sea" by Jules Verne
The voyage was uneventful and Manomet Hill was soon sighted.
"The Adventure Club Afloat" by Ralph Henry Barbour
When the white men came Bourne contained other Indian hamlets beside Manomet.
"Cape Cod and All the Pilgrim Land, June 1922, Volume 6, Number 4" by Various
The Steam-Engine Indicator, and the Improved Manometer, Steam and Vacuum Gauges; their Utility and Application.
"Atlantic Monthly,Volume 14, No. 82, August, 1864" by Various
The three manometers are filled to the same level with mercury, the quantity being adjusted by means of a pipette.
"Scientific American Supplement, No. 711, August 17, 1889" by Various
He spent weeks experimenting with a sensitive manometer, gauging all the scale of dynamics.
"Visionaries" by James Huneker
I then descended as deeply in the water as I could, the manometer showing thirty metres.
"Our Navy in the War" by Lawrence Perry
Thou didst but ask passage to Manomet.
"Standish of Standish" by Jane G. Austin
All I ask is that the bulb of a self-registering manometer be pressed.
"The Shadow World" by Hamlin Garland
The manometer of a steam-engine.
"The Sailor's Word-Book" by William Henry Smyth
A small air-pressure is applied and the variations in height of a delicate manometer noted.
"Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man" by Francis Gano Benedict
The woods of Manomet were full of butterflies.
"Old Plymouth Trails" by Winthrop Packard
The manometer now shows twenty-four meters, twenty-six meters.
"The Adventures of the U-202" by E. Spiegel
To the boot was attached a flexible tube, stopcock, pump, and if desired, a manometer for measuring the vacuum produced.
"Bloodletting Instruments in the National Museum of History and Technology" by Audrey Davis
To measure steam pressure we insert a manometer in the walls of the boiler.
"The Mechanism of Life" by Stéphane Leduc
The gas from the control valve passes through a visible glass orifice which is connected with the manometer.
"Chlorination of Water" by Joseph Race
This point is observed on the manometer and the result expressed in centimeters of mercury.
"Paint Technology and Tests" by Henry A. Gardner
In animals it is easy to attach manometers to the carotid artery and to measure the blood pressure accurately.
"Arteriosclerosis and Hypertension:" by Louis Marshall Warfield
The relative pressure in the inlet and outlet pipes can be read off on the manometer (M) placed on each of these tubes.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3" by Various
The needle on the manometer quivered and rose.
"The Secret Service Submarine" by Cyril Arthur Edward Ranger Gull
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### In news:

CMC and XacTorr™ Series digital capacitance manometers.
Well manometers see use primarily for shop calibration of process instruments and shop standards.
Because shop calibration is inconvenient for some process instruments, portable manomete...
M200-DI Wet/Wet Differential Pressure Smart Manometer .
Meriam Extends M200 Family with M200 DI Smart Manometer .
These data have the object of facilitating and standardizing the use of manometers and U-tubes as direct pressure indicating instruments or in the calibration of pressure recorders and controllers.
(1) This section requires chamber pressure to be monitored with a simple water manometer.
There are many modern alternatives to water manometers.
Built into the kit are a manometer, thermometer, CO leak detector and printer.
Read the chat with modern-day Manomet Plymouth Wampanoag Native American, Randy Joseph and Pilgrim interpreter, Patience Morton.
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### In science:

Before each test session, this sensor was calibrated using a simple system containing: a piston pump which creates the calibration pressure, a high precision manometer, a signal ampliﬁer which ampliﬁes the sensor output and a voltmeter .
Estimation of a Noise Level Using Coarse-Grained Entropy of Experimental Time Series of Internal Pressure in a Combustion Engine
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