(LP) - the length over which the midship section remains unchanged.

Related Terms

GROWLER

A piece of ice smaller than a BERGY BIT or FLOEBERG, often transparent but appearing green or almost black in color. It extends less than 1 meter above the sea surface and its length is less than 20 feet (6 meters). A growler is large enough to be a hazard to shipping but small enough that it may escape visual or radar detection.

ATOMIC ABSORPTION SPECTROSCOPY

Measures the radiation absorbed by chemically unbound atoms by analyzing the transmitted energy relative to the incident energy at each frequency. The procedure consists of diluting the fluid sample with methyl isobutyl ketone (MIBK) and directly aspirating the solution. The actual process of atomization involves reducing the solution to a fine spray, dissolving it, and finally vaporizing it with a flame. The vaporization of the metal particles depends upon their time in the flame, the flame temperature, and the composition of the flame gas. The spectrum occurs because atoms in the vapor state can absorb radiation at certain well-defined characteristic wave lengths. The wave length bands absorbed are very narrow and differ for each element. In addition, the absorption of radiant energy by electronic transitions from ground to excited state is essentially and absolute measure of the number of atoms in the flame and is, therefore, the concentration of the element in a sample.

ANGSTROM UNITS

A unit of wave length, equal in length to one ten billionth.

VOLUME FLOW RATE

The volume of fluid flowing through the cross- section of a conduit in unit time at the pressure and temperature prevailing in that section.

VELOCITY PROFILE

The mean velocity distribution of a fluid at a cross- section of a conduit. The velocity profile may be visualized by means of a two- or three-dimensional graph.

ABOVE-WATER HULL

The hull section of a vessel above the waterline, the visible part of a ship.

LIZARD

Short length of rope with an eye, used to hold another rope in position.

INTERNATIONAL NAUTICAL MILE

A unit of length equal to 1,852 meters, exactly

HARD

A section of otherwise muddy shoreline suitable for mooring or hauling out.

COUNTER

The part of the stern above the waterline that extends beyond the rudder stock culminating in a small transom. A long counter increases the waterline length when the boat is heeled, so increasing hull speed.

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