The actual lifting force of an inflated balloon, usually expressed in grams.

An instrument for determining the direction from which radio waves approach a receiver. It may consist of a manually operated direction indicator, or it may use a servo system to position the antenna automatically in the direction of the incident waves.

A temperature scale on which the freezing point of water equals 32

The range through which the input may be varied without initiating a response. Usually expressed as a percentage of full-scale range.

See calorie.

See radar theodolite, radio direction-finder.

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

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

The stage, on a fixed river gauge, corresponding to the top of the lowest banks within the reach for which the gauge is used as an index. Compare to flood stage.

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

An old nautical term for mercury barometer.

Same as river gauge.

Frequency Shift Keying. A form of frequency modulation of a data signal performed by a modem for transmission over dedicated wire or phone lines.

The rising of cold water from the deeper areas of the ocean to the surface. This phenomena often occurs along the California coast during the spring and summer.

A hygrometer based upon the diffusion of water vapor through a porous membrane.

An effect noted primarily in wet snow conditions when snow clings to the sides of a precipitation gauge and gradually accumulates until the gauge orifice is capped with accumulated snow. This effect can be minimized by using large collectors, and wind scr ...

The scientific study of the waters of the earth, especially with relation to the effects of precipitation and evaporation upon the occurrence and character of water in streams, lakes, and on or below the land surface. In terms of the hydrologic cycle, the ...

A rain gauge which automatically records the amount of precipitation collected, as a function of time.

An instrument which measures the spectral distribution of the intensity of direct solar radiation.

Downward-facing pyranometer used for measuring reflected solar radiation.