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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.



Related Terms

PRESSURE RELIEF VALVE

A spring loaded valve with preset activation pressure used to limit maximum pressure in hydraulic or pneumatic system and protect it from overpressure and damage.

HYDROSTATIC PRESSING

Compacting ceramic or metal powders by packing them in a rubber bag which is subjected to pressure from a hydraulic press.

GAS-OIL-RATIO (GOR)

The gas volume flow rate, relative to the oil volume flow rate, both converted to volumes at standard pressure and temperature.

OPTICAL INDICATOR

An instrument which makes a plot of pressure in the cylinder of an engine as a function of piston (or volume) displacement, making use of magnification by optical systems and photographic recording; for example, the small motion of a pressure diaphragm may be transmitted to a mirror to deflect a beam of light.

CENTIMETER OF MERCURY

A unit of pressure equal to the pressure that would support a column of mercury 1 centimeter high, having a density of 13.5951 grams per cubic centimeter, when the acceleration of gravity is equal to its standard value (980.665 centimeters per second per second); it is equal to 1333.22387415 pascals; it differs from the dekatorr by less than 1 part in 7,000,000. Abbreviated cmHg.

BAROTHERMOGRAPH

An instrument which automatically records pressure and temperature

QNH

A weather station's level pressure reduced to mean sea level by assuming the International Standard Atmosphere (ISA) conditions between the station and sea level.

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.

FAHRENHEIT TEMPERATURE

Temperature based on a scale in which, under standard atmospheric pressure

RATIO OF SPECIFIC HEATS (k)

Also known as isentropic coefficient. Is equal to the quotient of the heat capacity at constant pressure and the heat capacity at constant volume. (Cp/Cv). This parameter is tabulated for many pure components at standard conditions, but is technically dependent on the gas composition and temperature. The values are dimensionless and range from 1.0 to 1.6.

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