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An area established under provisions of the Marine Protection, Research, and Sanctuaries Act of 1972, Public Law 92- 532 (86 Stat. 1052), for the preservation and restoration of its conservation, recreational, ecological, or esthetic values. Such an area may lie in ocean waters as far seaward as the outer edge of the continental shelf, in coastal waters where the tide ebbs and flows, or in the Great Lakes and connecting waters, and may be classified as a habitat, species, research, recreational and esthetic, or unique area.

Related Terms

BALANCED RUDDER

A rudder design where the pivot point and the center of its area meet, reducing the effort needed to turn it.

It has about 20% of the rudder area forward of the rudder axis.

CENTRE OF BUOYANCY

The center of the area of the underwater transverse or longitudinal section of a hull at a particular trim, hence the point at which the force of buoyancy is regarded to be acting vertically upwards.

PNEUMATIC CONTROL VALVE

A valve in which the force of compressed air against a diaphragm is opposed by the force of a spring to control the area of the opening for a fluid stream.

PLASMA-ARC CUTTING

Metal cutting by melting a localized area with an arc followed by removal of metal by high-velocity, high-temperature ionized gas.

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.

PISTON GAGE SEE FREE-PISTON GAGE. PISTON METER

A variable-area, constanthead fluid-flow meter in which the position of the piston, moved by the buoyant force of the liquid, indicates the flow rate. Also known as piston-type area meter.

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.

PARISON SWELL

In blow molding, the ratio of the cross-sectional area of the pariso

PACKING DENSITY

The number of devices or gates per unit area of an integrated circuit. packing ring See piston ring.

OVERRUN

A cleared area extending beyond the end of a runway.

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