meter-An instrument for measuring the transmissivity of the atmosphere; a type of transmissometer. It consists of a constant- intensity collimated light source located at a suitable distance from a photoelectric cell. Variation in the turbidity of the atm ...

An instrument for measuring the frost point of the atmosphere.

A line drawn through geographical points having the same pluvial index.

Same as ombrometer.

Wind with a speed between 17 and 21 knots (19 and 24 mph); Beaufort scale number 5.

A protocol similar to RS232 which makes use of differential transmission to provide high speed data transmission over significantly longer distances.

Electromagnetic radiation lying in the wavelength interval between 0.8 micron and I millimeter. At the lower limit of this interval, the infrared radiation spectrum is bounded by visible radiation, while on its upper limit it is bounded by microwave radia ...

A small, limited-capacity central processing unit contained entirely on one semiconductor chip.

A strong wind characterized by a sudden onset, a duration on the order of minutes, and a rather sudden decrease in speed.

The temperature at which the liquid and solid forms of a substance may exist in equilibrium at a given pressure (usually one standard atmosphere). The true freezing point of water is known as the ice point.

The outer, solid portion of the earth: the crust of the earth.

Thermometer used for measuring the lowest temperature attained during a given interval of time, for example, a day.

Apparatus designed to measure and record the size distribution of raindrops as they occur in the atmosphere.

Solar and terrestrial radiation directed downwards (towards the earth's surface); incoming radiation.

A standard interface between a computer input/output port and a peripheral device. Signal properties including time duration, voltage. and current, are specified by the Electronic Industries Association.

Thermodynamic change of state of a system in which there is transfer of heat across the boundaries of the system. Compare to adiabatic process.

Same as Aeolian.

Rain gauge which registers precipitation that is too light to be registered by ordinary recording of the depth of water from precipitation. Same as ombrometer.

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 ...

A hypothetical body which absorbs some constant fraction, between zero and one, of all electromagnetic radiation incident upon it, which fraction is the absorptivity and is independent of wavelength. Compare to black body, white body.