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

A general term for instruments designed to measure the speed or force of the wind.

The attenuation of light.

A system of physical units based upon the use of the meter, the metric ton (106 grams), and the second as elementary quantities of length, mass, and time, respectively.

Wind with a speed between 11 and 16 knots (13 and 18 mph); Beaufort scale number 4.

The actual time during which physical events take place.

A method of winds aloft observation in which the elevation and azimuth angles of a theodolite are read while visually tracking a pilot balloon. Balloon height data is estimated from assumed balloon ascension rates.

In general. the severe wind of an intense tropical cyclone (hurricane or typhoon). The term has no further technical connotation, but, unfortunately, is easily conftlsed with the strictly defined hurricane-force wind,

An instrument for measuring the pressure of the atmosphere. The two principle types are aneroid and mercurial.

Balance of the water resources of a region, comparing precipitation and inflow with outflow, evaporation, and accumulation.

A thermometer which utilizes the thermal properties of gas. There are two forms of this instrument: (a) a type in which the gas is kept at constant volume, and pressure is the thermometric property, and (b) a type in which the gas is kept at constant pres ...

A fixed support for mounting maximum and minimum thermometers of the liquid-in-glass type. The support holds the thermometers at the correct operating attitude and also permits their rotation for resetting when desired.

in United States weather observing practice, the highest "instantaneous" wind speed recorded at a station during a specified period, usually the 24-hour observation day. Therefore, a peak gust need not be a true gust of wind.

The older name for the Celsius temperature scale. Officially abandoned by international agreement in 1948, but still in common use.

An instrument for the measurement of the rate of ice accretion on an unheated body.

A photometer that measures the received intensity of a distance tight source.

An evaluation of upper air temperature, pressure, and humidity from radio signals received from a balloon- borne radiosonde.

The most common of the principal rainbow phenomena, which appears as an arc of about 42

The number of cycles per second between the limits of a frequency band.

An instrument for measuring snow hardness in terms of the resistance of snow to the pressure exerted by a disk attached to a spring-loaded rod, a gauge calibrated in pounds per square inch registers the amount of resistance. See Canadian hardness gauge.