Temperature to which absolutely dry air would have to be brought in order for it to have the same density as moist air, considered at the same pressure.

The quantity to be measured (or modulated, or detected, or operated upon) which is received by an instrument. Thus, for a thermometer. temperature is the input quantity.

An instrument for rapidly obtaining samples of airborne dust; a type of dust counter. Particles pass through a cylindrical chamber, are drawn at high velocity through a narrow slit, and then impinge upon a microscope cover glass located a short distance f ...

A class of rain gauge in which the level of the collected rain water is measured by the position of a float resting on the surface of the water.

A basic equation in night visual range theory, relating the illuminance of a point source of light to distance and the transmissivity of the atmosphere.

Complementary Metal-Oxide Semiconductor. A method of making silicon chips that results in low power consumption by the circuits.

check chamber-A chamber use to check the sensing elements of radiosonde equipment.

Of equal or constant pressure, with respect to either space or time.

Same as constant-level balloon.

The gravity flow of water within soil.

The size of the area comprising a watershed or river basin. Also called catchment area.

Snow shower, particularly of a very light and brief nature.

A numbering system using a base number of 16 and including the ten decimal digits (0 to 9) along with six alpha digits (A to F). Thus. a digit is available to represent each of the possible values of a 4-bit binary digit.

The point (physical and/or electrical) where two distinct data processing elements meet.

A diagram showing the intensity of the radiation field in all directions from a transmitting radio or radar antenna at a given distance from the antenna.

The water portion of the earth as distinguished from the solid part, called the lithosphere, and from the gaseous outer envelope, called the atmosphere.

A cup anemometer with its shaft mechanically coupled to a magneto.

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

A device used by oceanographers to obtain subsurface samples of sea water. The "bottle" is lowered by wire, its valves open at both ends. It is then closed in situ by allowing a weight (called a messenger) to slide down the wire and strike the reversing m ...

The correctable part of the inaccuracy of an instrument.