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Pressure Jump: A sudden increase in the observed atmospheric pressure or station pressure.

Pressure Relief Valve: A valve used on hot water heating appliances to help keep the pressure in the heated tank or boiler from getting too high by allowing the relief of pressure from the valve.

Pressure Port: A threaded orifice which can be fitted with a pressure gauge or pressure transducer for determining the pressures within a motor while in operation.

Pressure Relief Valve (PRV): A device mounted on a hot water heater or boiler which is designed to release any high steam pressure in the tank to prevent tank explosions.

Pressure Tendency: The pressure characteristic and amount of pressure change during a specified time period, usually the three hour period preceding the observation.

Pressure-Treated Wood: Lumber that has been saturated with a preservative.

Pressure Transducer: Outputs electrical signal proportional to pressure.

Pressure Sensor: A pressure transducer sensing de-vice for water level measurement. A relative transducer is vented to the atmosphere and pressure readings are made relative to atmospheric pressure. An absol . . . View Full Definition

Pressure Gradient: The amount of pressure change that occurs over a fixed distance at a fixed altitude.

Pressure Altimeter: An aneroid barometer calibrated to indicate altitude in feet instead of units of pressure. It is read accurately only in a standard atmosphere and when the correct altimeter setting is used.