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Port Huron

(Encyclopedia)Port Huron hyo͝orˈən [key], city (1990 pop. 33,694), seat of St. Clair co., S Mich., a natural, deepwater port of entry at the junction of the St. Clair River with Lake Huron; inc. 1857. It is a sh...

precipitation, in chemistry

(Encyclopedia)precipitation, in chemistry, a process in which a solid is separated from a suspension, sol, or solution. In a suspension such as sand in water the solid spontaneously precipitates (settles out) on st...

pyroclastic flow

(Encyclopedia)pyroclastic flow, turbulent, fluidized mixture of rock, volcanic ash, and hot gas that moves like an avalanche away from a volcanic eruption. A pyroclastic flow may contain a mix of rock fragments ran...

‘Oumuamua

(Encyclopedia)‘Oumuamua ōmo͞oˈəmo͞oˈə [key], officially 1I/2017 U1 (‘Oumuamua), interstellar object, the first to be discovered in the solar system. Highly variable in brightness, it also is highly and u...

Freon

(Encyclopedia)Freon frēˈŏn [key] [trade name], any one of a special class of chemical compounds that are used as refrigerants, aerosol propellants, and solvents. These compounds are haloalkanes, i.e., halogen de...

Hiller, Stanley, Jr.

(Encyclopedia)Hiller, Stanley, Jr., 1924–2006, American aeronautical engineer and business executive, b. San Francisco. At 12 years old, he designed and produced gas-propelled toy cars, a business that led to the...

Absheron

(Encyclopedia)Absheron əp– [key], peninsula, c.40 mi (60 km) long, extending into the Caspian Sea, E Azerbaijan. It is a dry, hilly area at the eastern end of the Greater Caucasus Mts. and is underlain by rich o...

Eastern Highlands

(Encyclopedia)Eastern Highlands, c.2,400 mi (3,860 km) long, general name for the mountains and plateaus roughly paralleling the east and southeast coasts of Australia (including Tasmania) and forming the Continent...

Ketterle, Wolfgang

(Encyclopedia)Ketterle, Wolfgang, 1957–, German physicist, Ph.D. Max Planck Institute for Quantum Optics, Garching, Germany, 1986. He has been a professor at Massachusetts Institute of Technology since 1990. Kett...

Bay City

(Encyclopedia)Bay City. 1 City (2020 pop. 32,661), seat of Bay co., S Mich., a port of entry on the Saginaw River at its mouth on Saginaw Bay (an inlet of Lake ...