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

 

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

Pressure Transducer: Outputs electrical signal proportional to pressure.

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

Pressured Speech: Speech that is increased in amount, accelerated, and difficult or impossible to interrupt. Usually it is also loud and emphatic. Frequently the person talks without any social stimulation an . . . View Full Definition

Pressureless Ball: A special type of tennis ball that does not have a core of pressurized air as standard balls do but rather has a core made of solid rubber, or a core filled tightly with micro-particles. Qua . . . View Full Definition

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

Pressure Gauge: A water level gauge that is operated by the change in pressure at the bottom of a body of water due to the rise and fall of the water level. See gas purged pressure gauge.

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