psi

pounds per square inch.


Related Terms

HEAD

The measure of the pressure expressed in feet of height of water: 1 psi = 2.31 feet of water.

GAUGE PRESSURE

The pressure above that of atmospheric, 14.7 psi at sea level; absolute pressure minus 14.7 at sea level.

Safety NET

INMARSAT service for promulgating MSI to ships on the high seas, it includes shore-to-ship relays of distress alerts and communications for SAR coordination

PSI

Symbol or initials used to indicate pressure measured in pounds per square inch.

DIRECTIVITY FACTOR

  1. The ratio of radiated sound intensity at a remote point on the principal axis of a loudspeaker or other transducer, to the average intensity of the sound transmitted through a sphere passing through the remote point and concentric with the transducer; the frequency must be stated.
  2. The ratio of the square of the voltage produced by sound waves arriving parallel to the principal axis of a microphone or other receiving transducer, to the mean square of the voltage that would be produced if sound waves having the same frequency and mean-square pressure were arriving simultaneously from all directions with random phase; the frequency must be stated.

PLAN EQUATION

The mathematical statement that horsepower plan/33,000, where p mean effective pressure (pounds per square inch), l length of piston stroke (feet), a net area of piston (square inches), and n number of cycles completed per minute.

PIE`ZE

A unit of pressure equal to 1 sthe`ne per square meter, or to 1000 pascals. Abbreviated pz.

PICTURE ELEMENT

1. That portion, in facsimile, of the subject copy which is seen by the scanner at any instant; it can be considered a square area having dimensions equal to the width of the scanning line. 2. In television, any segment of a scanning line, the dimension of which along the line is exactly equal to the nominal line width; the area which is being explored at any instant in the scanning process. Also known as critical area; elemental area; pixel; recording spot; scanning spot.

PERCH

Also known as pole; rod. 1. A unit of length, equal to 5.5 yards, or 16.5 feet, or 5.0292 meters. 2. A unit of area, equal to 30.25 square yards, or 272.25 square feet, or 25.29285264 square meters.

OFFSET YIELD STRENGTH

That stress at which the strain surpasses by a specific amount (called the offset) an extension of the initial proportional portion of the stress-strain curve; usually expressed in pounds per square inch.

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