Table of Contents Glossary Ppt - Parts per thousand.


Purchase - The purchase of a tackle refers to its mechanical advantage. In general the more sheaves in the blocks that make up a tackle, the higher its mechanical advantage. The matter is slightly complicated by the fact that every tackle has a working end where the final run of rope leaves the last sheave. More mechanical advantage can be obtained if this end is attached to the moving load rather than the fixed end of the tackle.


Pulley - A simple machine consisting of a wheel over which a pulled rope or chain runs to change the direction of the pull used for lifting a load. An on sailboat a pulley is called a block.


Pythagorean Theorem - The square of the length of the hypotenuse of a right triangle equals the sum of the squares of the lengths of the other two sides.


Red Tide - A common term used for a harmful algal bloom (HAB)s, occur nearly every summer along the nation’s coasts. Often, the blooms turn the water a deep red. HABs, occur when colonies of algae—simple ocean plants that live in the sea—grow out of control while producing toxic or harmful effects on people, fish, shellfish, marine mammals and birds. The human illnesses caused by HABs, though rare, can be debilitating or even fatal.


Research - The systematic investigation into and study of materials and sources in order to establish facts and Reach new conclusions.


Right Angle - An angle with the measurement of 90 degrees. Right Triangle - A triangle with an inner angle of 90 degrees.


ROV (Remotely Operated Vehicle) - a mobile robot controlled by a remote using copper or fiber optic cables. A human operator sits in a shore-based station, boat or submarine bubble while watching a display that shows what the robot “sees.” The operator can also maneuver the robot.


Salinity - The amount of salt in the water.


Screw - A simple machine of the inclined plane type consisting of a spirally grooved solid cylinder and a correspondingly grooved hollow cylinder into which it fits.


Sea Breeze - A wind from the sea that develops over land near coasts. It is formed by increasing temperature differences between the land and water; these create a pressure minimum over the land due to its relative warmth, and forces higher pressure, cooler air from the sea to move inland. Generally, air temperature gets cooler relative to nearby locations as one moves closer to a large body of water. The sea has a greater heat capacity than land and can therefore absorb more heat than the land, so the surface of the sea warms up more slowly than the land’s surface.


Secchi Disk - An instrument used for measuring the clarity of water, especially seawater. It consists of a circular plate divided into alternating black and white quadrants and attached to a long measuring tape. The plate is lowered into the water, and the depth at which it is no longer visible from the surface is recorded. The Secchi disk is named after its inventor, Italian astronomer Angelo Secchi.


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