A device that measures the pressure exerted by a fluid relative to a perfect vacuum; used to measure pressures very close to a perfect vacuum.



Related Terms

ANEROID LIQUID-LEVEL METER

A mechanism to measure fluid depth by pressure of the fluid against a bellows which in turn acts on a manometer or signal transmitter.

ANEROID FLOWMETER

A mechanism to measure fluid flow rate by pressure of the fluid against a bellows counterbalanced by a calibrated spring.

VALVE

A device which controls fluid flow direction, pressure, or flow rate.

INTENSIFIER

A device which converts low pressure fluid power into higher pressure fluid power.

GAS THERMOMETER

A device to measure temperature by measuring the pressure exerted by a definite amount of gas enclosed in a constant volume; the gas (preferably hydrogen or helium) is enclosed in a glass or fused-quartz bulb connected to a mercury manometer. Also known as constant-volume gas thermometer.

BULB

The name given to the temperature-sensing device located in the fluid for which control or indication is provided. The bulb may be liquidfilled, gas filled, or gas-and-liquid filled. Changes in temperature produce pressure changes within the bulb which are transmitted to the controller.

COMPRESSIBILITY

Measure of ability of being compressed. The change in volume of a unit volume of a fluid when subjected to a unit change of pressure.

VAPOR PRESSURE-REID (RVP)

Measure of the pressure of vapor accumulated above a sample of gasoline or other volatile fuel in a standard bomb at 100°F (37.8°C). Used to predict the vapor locking tendencies of the fuel in a vehicle's fuel system. Controlled by law in some areas to limit air pollution from hydrocarbon evaporation while dispensing.

AIRSPEED INDICATOR

A device that computes and displays the speed of an aircraft relative to the air mass in which the aircraft is flying.

VAPOR PRESSURE

Pressure of a confined vapor in equilibrium with its liquid at specified temperature thus, a measure of a liquid's volatility.

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