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A device, similar to a potometer, for measuring transpiration, consisting of a vessel containing soil in which one or more plants are rooted and sealed so that water can escape only by transpiration from the plant.

Category:Meteorology

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

Category:Meteorology

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

Category:Meteorology

An instrument for recording global solar radiation.

Category:Meteorology

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

Category:Meteorology

The level at which ice crystals and snowflakes melt as they descend through the atmosphere.

Category:Meteorology

The array of indicating marks and figure in relation to which the position of an index is observed, i.e. a scale plate on a recorder.

Category:Meteorology

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

Category:Meteorology

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

Category:Meteorology

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.

Category:Meteorology

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.

Category:Meteorology

A tube designed to measure the rate of flow of fluids. It consists of a tube having a constriction or throat at its midsection. The difference between the pressure measured at the inlet and at the throat is a function of the fluid velocity. Compare to Pit ...

Category:Meteorology

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 ...

Category:Meteorology

A special type of radar target, usually a comer reflector, tied beneath a free balloon and designed to be an efficient reflector of radio energy.

Category:Meteorology

The interval between the lower and upper measuring limits of an instrument, i.e. a thermometer with a range of -35 to 50

Category:Meteorology

A series of Nansen-bottle water samples and associated temperature observations resulting from one release of a messenger.

Category:Meteorology

Defect in the action of an aneroid barometer resulting in a sluggish adjustment of the index toward the correct reading when the barometer is subjected to a large and rapid change in pressure.

Category:Meteorology

A common type of liquid-inglass thermometer, used, in meteorology, in psychrometers and as a maximum thermometer.

Category:Meteorology

In general, any object that reflects incident energy. Usually it is a device designed for specific reflection characteristics.

Category:Meteorology

The direction, with respect to magnetic north, from which the wind is blowing. Distinguish from true wind direction.

Category:Meteorology

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