Electromagnetic radiation of very short wavelength. lying within the wavelength interval of 0.1 to 1.5 angstroms (between gamma rays and ultraviolet radiation). X-rays penetrate various thicknesses of all solids, and they act on photographic plates in the ...

An area of low barometric pressure, with its attendant system of winds. Also called a depression or cyclone.

A coating of ice, generally clear and smooth. formed by the freezing of supercooled water on a surface.

The unit of speed in the nautical system; one nautical mile per hour. It is equal to 1.1508 statute miles per hour or 0.5144 meters per second.

Water condensed onto objects at or near the ground, due to the fact that their temperatures have fallen below the dew point temperature of the surrounding air, but not below freezing.

A unit of energy equal to 101 ergs or to 0.2389 calories.

Same as freezing point.

A large plastic constant-level balloon for duration flying at very high altitudes.

The inherent imprecision of a given process of measurement, the unpredictable component of repeated independent measurements of the same object under sensibly uniform conditions.

Dihydrogen oxide, molecular formula H2O.

Movernent of water through the soil surface into the soil, or the quantity of water entering the soil. Infiltration is equal to the total precipitation less the losses due to interception by vegetation. retention in depressions on the land surface, evapor ...

In meteorology, a deflecting force acting on a body in motion and resulting from the earth's rotation. It deflects air currents to the right in the northern hemisphere and to the left in the southern hemisphere, thus having an effect on wind direction.

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

The temperature registered by a thermometer with its bulb at the level of the tops of the grass blades in short turf.

The distance or length of flow of the air past a point during a given interval of time.

General name for an instrument designed to measure the vertical component of the wind speed. See anemoclinometer.

A unit of luminance or brightness equal to 1/d candles per foot'.

A type of wind vane having a split or V-shaped tail. The apex orients itself to the direction of the wind.

Same as pitot tube.

In meteorology, an area of low pressure; a low or trough.