Abbreviation for binary digit. The smallest unit of information, equal to one binary decision, i.e. 1/0, on/off, yes/no.

A protective coating applied to circuits.

A line drawn through all points on a map having the same amount of cloudiness.

A calorimetric radiation instrument of historic interest used for the measurement of outgoing heat radiation from the earth during an interval of time. The time integration is performed by allowing the radiation to fall on an uninsulated vessel containing ...

See bimetallic thermometer.

An old nautical term for mercury barometer.

A radiosonde which is dropped by parachute from an aircraft for the purpose of obtaining soundings of the atmosphere below.

The rate of decrease of pressure per unit distance at a fixed time.

A measure of the attenuation due to scattering, of light as it traverses a medium containing scattering particles.

A instrument designed to study small fluctuations of some quantity. The microbarograph is an example of a recording pressure variometer.

A feeble oscillatory disturbance of the earth's crust, detectable only by very sensitive seismographs. Certain types of microseisms seem to be closely correlated with pressure disturbances. See microbarm.

A wind blowing in the same direction as the heading of a moving object. thus assisting the object's intended progress. The opposite of a head wind.

Operation mode of a communication circuit in which one end can only transmit and the other end can only receive.

An instrument for the measurement of the rate of ice accretion on an unheated body.

Formation of a single water drop by the union of two or more colliding drops.

Part of a computer word that has meaning in itself, often, a byte.

The process by which small particles suspended in a medium of a different refractive index diffuse a portion of the incident radiation in all directions. In scattering no energy transformation results, only a change in the spatial distribution of the radi ...

A wind blowing in a direction opposite to the heading of a moving object, thus opposing the object's intended progress; the opposite of a tailwind.

The ceiling classification which is applied when the ceiling height is determined by timing the ascent and disappearance of a ceiling balloon or pilot balloon.

The process by which events in the real world are translated into machine-readable signals.