In thermodynamics, the integrating factor of the differential equation referred to as the first law of thermodynamics, In statistical mechanics, a measure of translational molecular kinetic energy (with three degrees of freedom). In general, the degree of ...

An old nautical term for mercury barometer.

Generic term for rapid variations in apparent position, brightness, or color of a distant luminous. object viewed through the atmosphere.

Any device or instrument for measuring salinity, especially one based on electrical conductivity methods.

Conditions to which a device is subjected, not including the variable measured by the device. See normal operating conditions, reference operating conditions.

A rain gauge capable of measuring very small amounts of precipitation. Also called micropluviometer, trace recorder.

The unit of force in the centimeter-gram-second system of physical units, i.e. one gm cm per sec2, equal to 7.233 x 10-5 poundal.

An estimate of the temperature of an incandescent body, determined by observing the wavelength at which it is emitting with peak intensity (its color) and using that wavelength in Wien's law.

Wind with a speed between 4 and 6 knots (4 and 7 mph), Beaufort scale number 2.

Difference between the temperatures of the dry-bulb and the wet-bulb thermometers of a psychrometer.

Upwarddirected solar radiation, reflected by the earth's surface and the atmosphere.

A temperature telemeter.

An instrument for measuring temperature by utilizing the variation of the physical properties of substances according to their thermal states. Thermometers may be classified into types according to their construction; deformation thermometer, electrical t ...

Precipitation caused by the ascent of moist air over an orographic barrier such as a Mountain range.

Name given to the unit of pressure in the International System of Units (SI). Equal to 1 newton/meter2 or 0.01 millibar.

A unit of power equal to one joule per second or 10' ergs per second.

See standard atmosphere.

A radiosonde whose carrier wave is switched on and off in such a manner that the interval of time between the transmission of signals if a function of the magnitude of the meteorological elements being measured.

An instrument for recording global solar radiation.

The lowest temperature that can be obtained on a wet-bulb thermometer in any given sample of air. Obtained by evaporation of water (or ice) from the muslin wick. Used in computing dew point and relative humidity.