An element that can control current without moving parts, heated filaments, or vacuum gaps.

In reference to a wind energy conversion device, the ratio of rotor blade surface area to the frontal, swept area that the rotor passes through.

The two times of the year when the sun is apparently farthest north and south of the earth's equator; usually occurring on or around June 21 (summer solstice in northern hemisphere, winter solstice for southern hemisphere) and December 21 (winter solstice ...

The component of either a liquid or solid solution that is present to a lesser or minor extent: the component that is dissolved in thesolution.

In chemistry,a homogeneous dispersion of two or more kinds of molecular or ionic species. Solution may be composed of any combination of liquids, solids, or gases, but they always consist of a single phase.

Heating an alloy to a suitable temperature, holding at that temperature long enough to cause one or more constituents to enter into solid solution, and then cooling rapidly enough to hold these constituents in solution.

Electrode potential where half-cell reaction involves only the metal electrode and its ion.

The component of either a liquid or solid solution that is present to a greater or major extent; the component that dissolves the solute.

Seaman who was born aboard a warship. As this was once considered to be one of the essentials of the perfect seaman, it has long been a complimentary term.

SOnar Navigation and Ranging - A device which emits pulses of high frequency sound which are reflected by any solid object they encounter. The time from the emission of the pulse and the arrival of its returning echo is measured, giving a range to the obj ...

An anemometer which measures wind speed by means of the properties of wind-borne sound waves. It operates on the principle that the propagation velocity of a sound wave in a moving medium is equal to the velocity of sound with respect to the medium plus t ...

The point (speed of sound) at which air flow through an orifice can not increase regardless of pressure drop.

A thermometer based upon the principle that the velocity of a sound wave is a function of the temperature of the medium through which it passes. Sonic thermometers possess very short time-constants and eliminate radiation error.

Morse Code Distress Signal (

A distress call made by a vessel requiring assistance. These three letters were chosen because they were easy to make and read using Morse Code. Some believe the letters meant "Save Our Ship" or "Save Our Souls".

A wind coming from the southwest

To measure the depth of the water with a lead. Also said of a whale when it dives to the bottom.

Energy that is transmitted by pressure waves in air or other materials and is the objective cause of the sensation of hearing.

To obtain his reaction to something.

Same as an upper air observation, but commonly used to refer to a single complete radiosonde observation.