An instrument used to measure the water vapor content of the air.

A line of equal or constant temperature.

Instrument for measuring the depth to which the soil is frozen.

In nautical terminology, a contraction for "weather glass" (a mercury barometer).

Same as atmometer.

An absolute temperature scale with the degree of the Fahrenheit scale and the zero point of the Kelvin scale. The freezing point of water equals 491.69

An instrument for measuring the relative speed of a fluid. It consists of a concentric pipe arrangement in which the inner pipe is open at one end and the outer pipe is perforated and closed at both ends. Each pipe is connected to a manometer. The unit is ...

Value of soil moisture, expressed as a percentage of the mass of dry soil, below which a plant living in the soil dies by wilting.

Same as instrument shelter.

A device that allows a terminal or computer at one location to communicate with a terminal or computer at a distant location via wire or phone lines.

Very generally, any moving- stream of air. It has no particular technical connotation.

A line drawn through points of equal humidity on given surface.

A hygrometer which includes an arrangement for the time recording of atmospheric humidity.

film hygrometer element-An electrical hygrometer element constructed of a plastic strip coated with a film of carbon black dispersed in a hygroscopic binder. Variations in atmospheric moisture content vary the volume of the binder and thus change the resi ...

A box-like structure designed to protect certain meteorological instruments from exposure to direct sunlight, precipitation, and condensation, while at the same time providing adequate ventilation. Instrument shelters are painted white, have louvered side ...

The indicating part of an instrument. For example, the hand of a watch or the meniscus of a mercury column.

Ice crystal deposits formed by sublimation (conversion of water vapor directly to ice) when temperature and dew point are below freezing.

The measurement and computation of wind speeds and directions at various levels above the surface of the earth. Methods include pilot balloon observations, rabals, rawin or rawinsonde observations, radar tracking, or acoustic sounding.

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

Same as contact anemometer.