Same as mercury barometer.

(1) The ratio of the speeds of a chemical reaction at two temperatures differing by 10

See gust and peak gust.

An instrument used to measure and record earthquake vibrations and other earth tremors.

An instrument which measures combined direct solar radiation and diffuse sky radiation. See pyrheliometer, Robitzsch actinograph. solarimeter. See also albedometer.

The total infrared radiation emitted from the earth's surface. To be carefully distinguished from atmospheric radiation, effective terrestrial radiation, and insolation.

The maximum distance, usually horizontally, at which a given object or light source is just visible under particular conditions of transmittance and background luminance.

The ratio of the output of an instrument to the input value, i.e. a rain gauge with a sensitivity of 1 tip per 0.01"

Any one of a family of circular arcs consisting of concentric colored bands, arranged from red on the inside to blue on the outside, which may be seen on a "sheet" of water drops (rain, fog, spray). The most common of the many possible is the primary rain ...

The visibility along an identified runway, determined from a specified point on the runway with the observer facing in the same direction as a pilot using the runway. Compare to runway visible range.

A numbering system using a base number of 16 and including the ten decimal digits (0 to 9) along with six alpha digits (A to F). Thus. a digit is available to represent each of the possible values of a 4-bit binary digit.

The element directly responsive to the value of the measured variable.

An apparatus, used in studying soil temperatures, for measuring the total supply of heat during a given period.

A mercury barometer which measures atmospheric pressure by weighing the mercury in the column or cistern.

The difference between the outgoing infrared terrestrial radiation of the earth's surface and the downcoming infrared counterradiation from the atmosphere.

Dihydrogen oxide, molecular formula H2O.

That portion of the atmosphere which is above the lower troposphere. Generally applied to levels above 850 mb.

Wind with a speed between 48 and 55 knots (55 and 63 mph), Beaufort scale number 10.

Contraction for radiosonde observation.

The range of operating conditions of a device within which operating influences are negligible. The range is usually narrow. Reference operating conditions are the conditions under which reference performance is stated and the base from which the values o ...