A c.g.s. (centimeter-gram-second) unit of mass. Originally defined as the mass of 1 cubic centimeter of water at 4

The temperature at which an object gives out as much radiation as it receives from its surroundings.

Frozen or partly frozen rain.

A measure of the amount of "spin" (or rotation) in the atmosphere.

Name applied to a class of instruments which measure the liquid content of the atmosphere.

An instrument for the measurement of the net flux of downward and upward total (solar and terrestrial) radiation through a horizontal surface.

A type of climatic diagram whose coordinates are some form of temperature vs. a form of humidity or precipitation.

A nephoscope in which the motion of the cloud is observed by its reflection in a mirror.

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

An instrument consisting of a series of graduated cylinders possessing selective collection efficiencies. It is used for the measurement of quantities relating to the size distribution of cloud droplets.

(1) The ratio of the speeds of a chemical reaction at two temperatures differing by 10

The greatest distance at which it is just possible to see and recognize with the unaided eye (1) in the daytime, a prominent dark object against the sky at the horizon, and (2) at night, a known, preferably unfocused, moderately intense light source.

A thin metal disc partially evacuated of air used to measure atmospheric pressure by measuring its expansion and contraction.

The height ascribed to the lowest layer of clouds or obscuring phenomena when it is reported as broken, overcast, or obscuration and not classified as "thin" or "partial." The ceiling is termed unlimited when these conditions are not satisfied. ...

A spring which is designed to achieve a fixed spring constant over a wide temperature range. Usually, this involves an alloy with high nickel content such as Ni-Span C. It is common for these springs to be stress relieved at elevated temperature after for ...

A conically shaped, copper rain gauge shield.

See bimetallic thermometer.

A semiconductor which exhibits rapid and extremely large changes in resistance for relatively small changes in temperature.

The difference between the air temperature and the dew-point. Also called dew-point deficit, dew-point depression.

A device for computing certain psychrometric data, usually the dew point and the relative humidity, from known values of the dry-bulb and wet-bulb temperatures and the atmospheric pressure. One type is the circular slide-rule form and, like the psychromet ...