A radar term for a single pulse of radio energy.

A device, similar to a phytometer, for measuring transpiration. It consists of a small vessel containing water and sealed so that the only escape of moisture is by transpiration from a leaf, twig, or small plant with its cut end inserted in the water.

The actual time during which physical events take place.

See approximate absolute temperature scale, Celsius temperature scale, centigrade temperature scale, Fahrenheit temperature scale, Kelvin temperature scale, Rankine temperature scale, Reaumur temperature scale,

Precipitation falling from a cloud, usually in wisps or streaks, but evaporating before it reaches the ground.

An instrument used to measure the amount of dew formed on a given surface.

An accumulation of granular ice tufts on the windward sides of exposed objects that is formed from supercooled fog or cloud and built out directly against the wind.

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 ...

An instrument which measures the intensity of radiation by determining the amount of chemical change( or fluorescence produced by that radiation.

A common type of terrestrial scintillation; shimmering over a hot surface (such as a roadway) on a quiet, cloudless. summer day.

Solar and terrestrial radiation directed downwards (towards the earth's surface); incoming radiation.

A form of psychrometer with wet-bulb and dry-bulb thermometers mounted on opposite sides of a specialty designed graph of the psychrometric tables. It is so arranged that the intersections of two curves determined by the wet-bulb and dry-bulb readings -yi ...

An aneroid barograph designed to record atmospheric pressure variations of very small magnitude.

An instrument for measuring the difference between incoming and outgoing terrestrial radiation.

Radiation with wavelengths less than 4 microns.

An aneroid barometer with a scale graduated in altitude instead of pressure units.

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

Any quantity, such as force velocity, or acceleration, which has both magnitude and direction at each point in space, as opposed to scalar which has magnitude only. Such a quantity may be represented geometrically by an arrow of length proportional to its ...

pattern barometer-Mercurial barometer with a fixed scale and cistern and which therefore requires only one adjustment before each reading.

A hygrometer which determines the amount of precipitable moisture in a given region of the atmosphere by measuring attenuation of radiant energy caused by the absorption bands of water vapor.