Table of Contents Glossary


Seine Net - A large fishing net made to hang vertically in the water by weights at the lower edge and floats at the top.


Simple Machines - A simple device, such as a lever, pulley, or inclined plane; a machine without moving parts used to overcome resistance at one point by applying force at another.


Specific Gravity - The ratio of the density of any substance to the density of a standard substance, water being the standard for liquids and solids.


Straight Line - A line with a specific start and end point measuring 180 degrees. Standard Units - A definite magnitude of a physical quantity, defined and adopted by convention and/or by law, that is used as a standard for measurement of the same physical quantity. Any other value of the physical quantity can be expressed as a simple multiple of the unit of measurement. For example, length is a physical quantity. The meter is a unit of length that represents a definite predetermined length. When we say 10 meters or 10 m, we actually mean 10 times the definite predetermined length called “meter”.


Surface Area - The total area of the faces and curved surface of a solid figure.


Solution - A mixture of substances that are blended so completely that the mixute looks the same everywhere.


Sonar - A technique that uses sound propagation (usually underwater, in Submarine and ROV navigation) to navigate, communicate with or detect other vessels or structures.


Tack - The act of changing from port to starboard (left to right) while sailing upwind or close-hauled.


Tide - A generic term used to define the alternating rise and fall in sea level with respect to the land, produced by the gravitational attraction of the moon and the sun. To a much smaller extent, tides also occur in large lakes, the atmosphere, and within the solid crust of the earth, acted upon by these same gravitational forces of the moon and sun. Additional nonastronomical factors such as configuration of the coastline, local depth of the water, ocean-floor topography, and other hydrographic and meteorological influences may play an important role in altering the range, interval between high and low water, an times of arrival of the tides.


Tower - Supports rotor and nacelle and lifts entire setup to higher elevation where blades can safely clear the ground.


Trade Winds - The prevailing surface winds over the tropical ocean are the trade winds that blow persistently from the northeast (toward the southwest) in the Northern Hemisphere and from the southeast (toward the northwest) in the Southern Hemisphere. The name for these winds was coined by sea captains who sailed for trading companies and took advantage of their persistent speed and direction when crossing the ocean. Trade winds drive both North and South Equatorial Currents westward, thus transporting warm ocean-surface waters in that direction. True Wind - Wind relative to a fixed point on the earth.


Turbidity - How clear water is or how deep one can see into the water. 136


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