Columbia Encyclopedia

Search results

500 results found

pen

(Encyclopedia)pen, pointed implement used in writing or drawing to apply ink or a similar colored fluid to any surface, such as paper. Various kinds of pens have been used since ancient times. Reeds that were slit ...

Le Châtelier's principle

(Encyclopedia)Le Châtelier's principle, chemical principle that states that if a system in equilibrium is disturbed by changes in determining factors, such as temperature, pressure, and concentration of components...

bowling

(Encyclopedia)bowling, indoor sport, also called tenpins, played by rolling a ball down an alley at ten pins; for lawn bowling, see bowls. Bowling is one of the most popular participatory sports in the United State...

Carleton, Guy, 1st Baron Dorchester

(Encyclopedia)Carleton, Guy, 1st Baron Dorchester, 1724–1808, governor of Quebec and British commander during the American Revolution. He began his service in America in 1758 and distinguished himself in the Fren...

Niagara Falls, waterfall, United States and Canada

(Encyclopedia)Niagara Falls, in the Niagara River, W N.Y. and S Ont., Canada; one of the most famous spectacles in North America. The falls are on the international line between the cities of Niagara Falls, N.Y., a...

Mercury, in astronomy

(Encyclopedia)Mercury, in astronomy, nearest planet to the sun, at a mean distance of 36 million mi (58 million km); its period of revolution is 88 days. Mercury passes through phases similar to those of the moon a...

non-Euclidean geometry

(Encyclopedia)non-Euclidean geometry, branch of geometry in which the fifth postulate of Euclidean geometry, which allows one and only one line parallel to a given line through a given external point, is replaced b...

Drake's Bay

(Encyclopedia)Drake's Bay, inlet of the Pacific Ocean, formed by the San Andreas fault, W Calif., NW of San Francisco. Point Reyes forms its outer arm. The bay was visited by Sir Francis Drake in 1579. ...

Davis Strait

(Encyclopedia)Davis Strait, c.400 mi (640 km) long and c.180 mi (290 km) wide at the narrowest point, between Greenland and Baffin Island, NE Canada, connecting the Atlantic Ocean and Baffin Bay. Large amounts of i...

isotherm

(Encyclopedia)isotherm, line drawn on a map of a particular region of the earth's surface connecting points of equal temperature; each point reflects one temperature reading or an average of several readings over a...