An instrument which measures a quantity (such as pressure or temperature) in absolute units by means of simple physical measurements on the instrument.



Related Terms

FREE-PISTON GAGE

An instrument for measuring high fluid pressures in which the pressure is applied to the face of a small piston that can move in a cylinder and the force needed to keep the piston stationary is determined. Also known as piston gage.

ANEROID BAROMETER

An instrument which determines atmospheric pressure by the effect of such pressure on a thin-metal cylinder from which the air has been partly exhausted

ACOUSTIC RADIOMETER

An instrument for measuring sound intensity by determining the unidirectional steady-state pressure caused by the reflection or absorption of a sound wave at a boundary.

CAPILLARYCOLLECTOR

An instrument for collecting liquid water from the atmosphere; the collecting head is fabricated of a porous material having a pore size of the order of 30 micrometers; the pressure difference across the water-air interface prevents air from entering the capillary system while allowing free flow of water.

PRESSURE GAUGE

Instrument for measuring the pressure exerted by the contents on its container.

KYMOGRAPH

An instrument that records pressure variations of sound waves.

DIFFERENTIAL MANOMETER

An instrument in which the difference in pressure between two sources is determined from the vertical distance between the surfaces of a liquid in two legs of an erect or inverted U-shaped tube when each of the legs is connected to one of the sources.

DEADWEIGHT GAGE

An instrument used as a standard for calibrating pressure gages in which known hydraulic pressures are generated by means of freely balanced (dead) weights loaded on a calibrated piston.

BAROTHERMOGRAPH

An instrument which automatically records pressure and temperature

MERCURIAL BAROMETER

An instrument which determines atmospheric pressure by measuring the height of a column of mercury which the atmosphere will support.

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