Columbia Encyclopedia
Search results
245 results found
photoelectric cell
(Encyclopedia) CE5 Photoelectric cell: Light causes a photosensitive surface to emit electrons, which flow as current to the positive terminal. A galvanometer measures the current and thus indicates light intensi...Zhou Enlai
(Encyclopedia)Zhou Enlai or Chou En-lai both: jō ĕn-lī [key], 1898–1976, Chinese Communist leader. A member of a noted Mandarin family, he was educated at an American-supported school in China and a university...Tonga
(Encyclopedia)Tonga tŏngˈgə [key], officially Kingdom of Tonga, island kingdom (2015 est. pop. 106,000), 270 sq mi (699 sq km), South Pacific, c.2000 mi (3,220 km) NE of Sydney, Australia. Tonga is the only surv...Iran-Iraq War
(Encyclopedia)Iran-Iraq War, 1980–88, protracted military conflict between Iran and Iraq. It officially began on Sept. 22, 1980, with an Iraqi land and air invasion of western Iran, although Iraqi spokespersons m...Darrow, Clarence Seward
(Encyclopedia)Darrow, Clarence Seward, 1857–1938, American lawyer, b. Kinsman, Ohio. He first practiced law in Ashtabula, Ohio. In 1887 he moved to Chicago, where he was corporation counsel for several years and ...Seattle
(Encyclopedia)Seattle sēătˈəl [key], city (2020 pop. 737,015), seat of King co., W Wash., built on seven ...erosion
(Encyclopedia)erosion ĭrōˈzhən [key], general term for the processes by which the surface of the earth is constantly being worn away. The principal agents are gravity, running water, near-shore waves, ice (most...cosmic rays
(Encyclopedia)cosmic rays, charged particles moving at nearly the speed of light reaching the earth from outer space. Primary cosmic rays consist mostly of protons (nuclei of hydrogen atoms), some alpha particles (...piano
(Encyclopedia)piano or pianoforte, musical instrument whose sound is produced by vibrating strings struck by felt hammers that are controlled from a keyboard. The piano's earliest predecessor was the dulcimer. The ...Chirac, Jacques René
(Encyclopedia)Chirac, Jacques René zhäk rənāˈ shēräkˈ [key], 1932–2019, French political leader, president of France (1995–2007), b. Paris. He attended the National School of Administration, joined the ...Browse by Subject
- Earth and the Environment +-
- History +-
- Literature and the Arts +-
- Medicine +-
- People +-
- Philosophy and Religion +-
-
Places
+-
- Africa
- Asia
- Australia and Oceania
- Britain, Ireland, France, and the Low Countries
- Commonwealth of Independent States and the Baltic Nations
- Germany, Scandinavia, and Central Europe
- Latin America and the Caribbean
- Oceans, Continents, and Polar Regions
- Spain, Portugal, Italy, Greece, and the Balkans
- United States, Canada, and Greenland
- Plants and Animals +-
- Science and Technology +-
- Social Sciences and the Law +-
- Sports and Everyday Life +-
