Pounds per square inch, absolute.

Pounds per square inch, differential.

Pounds/force per square inch gauge.

Pounds per square inch, gauge. Pressure indicated by a pressure gauge.

Port State Information Exchange.

Phase Shift Keying. A form of phase modulation of a data signal performed by a modem for transmission over dedicated wire or phone lines.

Portable Sampling Unit

Carries supplies to drilling units or installations during field de-velopment or production.

A self-recording psychrometer.

An instrument for measuring relative humidity by means of wet and dry-bulb temperatures.

An instrument used to measure the water vapor content of the air. A type of hygrometer. It consists of a wet-bulb and a dry-bulb thermometer. See aspiration psychrometer, Assmann psychrometer. hygrodeik, sling psychrometer.

A device for computing certain psychrometric data, usually the dew point and the relative humidity, from known values of the dry-bulb and wet-bulb temperatures and the atmospheric pressure. One type is the circular slide-rule form and, like the psychromet ...

Tables prepared from the psychrometric formula and used to obtain vapor pressure, relative humidity, and dew point from values of wet-bulb and dry-bulb temperatures.

The analysis of atmospheric conditions, particularly moisture in the air.

Has to do with the properties of air-water vapor mixtures in the atmosphere.

Polytetrafluorethylene.

Power Take Off

Port and Tanker Safety Act.

A name usually given to a State body having control or regulation of public utilities.

A law that requires electric utilities to purchase electricity produced from qualifying power producers that use renewable energy resources or are cogenerators. Utilities are required to purchase power at a rate equal to the avoided cost of generating the ...