Columbia Encyclopedia

Search results

319 results found

small arms

(Encyclopedia)small arms, firearms designed primarily to be carried and fired by one person and, generally, held in the hands, as distinguished from heavy arms, or artillery. Automatic small arms were develope...

battery, electric

(Encyclopedia)CE5 Lead storage cell: At the lead-dioxide electrode, electrons from the circuit combine with lead dioxide and sulfuric acid to form lead sulfate and water. At the spongy-lead electrode, lead react...

Sahara

(Encyclopedia)Sahara səhârˈə [key] [Arab.,=desert], world's largest desert, c.3,500,000 sq mi (9,065,000 sq km), N Africa; the western part of a great arid zone that continues into SW Asia. Extending more than ...

wind

(Encyclopedia)wind, flow of air relative to the earth's surface. A wind is named according to the point of the compass from which it blows, e.g., a wind blowing from the north is a north wind. The diurnal, or dai...

Moscow, city, Russia

(Encyclopedia)Moscow mŏsˈkou, –kō [key], Rus. Moskva, city (1991 est. pop. 8,802,000), capital of Russia and of Moscow region and the administrative center of the Central federal district, W central European R...

water pollution

(Encyclopedia)water pollution, contamination of water resources by harmful wastes; see also sewerage, water supply, pollution, and environmentalism. The United States has enacted extensive federal legislation to ...

lighting

(Encyclopedia)CE5 Incandescent lamp CE5 Basic fluorescent lamp lighting, light produced by artificial means to allow visibility in enclosures and at night. For stage lighting, see scene design and stage ligh...

rubber

(Encyclopedia)CE5 Basic molecules in rubber rubber, any solid substance that upon vulcanization becomes elastic; the term includes natural rubber (caoutchouc) and synthetic rubber. The term elastomer is sometim...

Lesotho

(Encyclopedia)CE5 Lesotho ləsōˈtō [key], officially Kingdom of Lesotho, kingdom (2015 est. pop. 2,175,000), 11,720 sq mi (30,355 sq km), S Africa. It is an enclave within the Republic of South Africa. Maseru...

Obama, Barack

(Encyclopedia)Obama, Barack (Barack Hussein Obama 2d), bəräkˈ ho͞osānˈ ōbäˈmə [key], 1961–, 44th president of the United States (2009–17), b. Honolulu, grad. Columbia (B.A. 1983), Harvard Law School ...