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 ...

A scale with the ice point at zero degrees and the boiling point of water at 80 degrees, with pressure of one atmosphere.

The difference between temperature measurements taken at two significant levels above the ground. Temperatures at 10 and 40 meters are commonly used.

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

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

That horizontal wind velocity at which the Coriolis acceleration exactly balances the horizontal pressure force. It is directed along contour lines or isobars.

See standard atmosphere.

A temperature telemeter.

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

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

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

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.

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

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.

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 statement that the viscosity of air is independent of the density of air.

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.

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