Columbia Encyclopedia

Search results

500 results found

transmigration of souls

(Encyclopedia)transmigration of souls or metempsychosis mətĕmˌsəkōˈsĭs [key] [Gr.,=change of soul], a belief common to many cultures, in which the soul passes from one body to another, either human, animal, ...

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...

specific gravity

(Encyclopedia)specific gravity, ratio of the weight of a given volume of a substance to the weight of an equal volume of some reference substance, or, equivalently, the ratio of the masses of equal volumes of the t...

Louis XVII, titular king of France

(Encyclopedia)Louis XVII (Louis Charles), 1785–1795?, titular king of France (1793–95), known in popular legend as the “lost dauphin.” The second son of King Louis XVI and Queen Marie Antoinette, he became ...

mass extinction

(Encyclopedia)mass extinction, the extinction of a large percentage of the earth's species, opening ecological niches for other species to fill. There have been at least ten such events. The five greatest were thos...

constitution, principles of government

(Encyclopedia)constitution, fundamental principles of government in a nation, either implied in its laws, institutions, and customs, or embodied in one fundamental document or in several. In the first category—cu...

book lung

(Encyclopedia)book lung, terrestrial respiratory organ characteristic of arachnids such as scorpions and primitive spiders. Each book lung consists of hollow flat plates. Air bathes the outer surface of the plates ...

mineral water

(Encyclopedia)mineral water, spring water containing various mineral salts, especially the carbonates, chlorides, phosphates, silicates, sulfides, and sulfates of calcium, iron, lithium, magnesium, potassium, sodiu...

argon

(Encyclopedia)argon ärˈgŏn [key] [Gr.,=inert], gaseous chemical element; symbol Ar; at. no. 18; at. wt. 39.948; m.p. −189.2℃; b.p. −185.7℃; density 1.784 grams per liter at STP; valence 0. Argon is a col...

Keynes, John Maynard, Baron Keynes of Tilton

(Encyclopedia)Keynes, John Maynard, Baron Keynes of Tilton kānz [key], 1883–1946, English economist and monetary expert, studied at Eton and Cambridge. Keynesian economics stands as the most influential eco...