Columbia Encyclopedia

Search results

458 results found

diffusion

(Encyclopedia)diffusion, in chemistry, the spontaneous migration of substances from regions where their concentration is high to regions where their concentration is low. Diffusion is important in many life process...

parallax

(Encyclopedia)CE5 The trigonometric parallax of a star, expressed by the angle θ, is a measure of its apparent motion against the background of more distant stars as a result of the earth's motions in its orbit...

friction

(Encyclopedia)friction, resistance offered to the movement of one body past another body with which it is in contact. In certain situations friction is desired. Without friction the wheels of a locomotive could not...

minstrel show

(Encyclopedia)minstrel show, stage entertainment by white performers made up as blacks. Thomas Dartmouth Rice, who gave (c.1828) the first solo performance in blackface and introduced the song-and-dance act Jim Cro...

acetic acid

(Encyclopedia)acetic acid əsēˈtĭk [key], CH3CO2H, colorless liquid that has a characteristic pungent odor, boils at 118℃, and is miscible with water in all proportions; it is a weak organic carboxylic acid (s...

magnetic pole

(Encyclopedia)magnetic pole, the two roughly opposite ends of the planet where the earth's magnetic intensity is the greatest, as the north and south magnetic poles. For the magnetic north, it is the direction from...

Toland, John

(Encyclopedia)Toland, John tōˈlənd [key], 1670–1722, British deist, b. Ireland. Brought up a Roman Catholic, Toland became a Protestant at 16. He studied at Glasgow, Edinburgh, and Leiden and after 1694 lived ...

Verne, Jules

(Encyclopedia)Verne, Jules vûrn; zhül vĕrn [key], 1828–1905, French novelist, originator of modern science fiction. After completing his studies at the Nantes lycée, he went to Paris to study law. He early be...

differential

(Encyclopedia)differential, in the automobile, a set of gears used on the driving (usually rear) axle. The two wheels on the driving axle must be interconnected in order to receive their energy from the same source...

Hollywood

(Encyclopedia)Hollywood. 1 Community (2020 population 35,757) within the city of Los Angeles, S Calif., on the slopes of the Santa Monica Mts.; inc. 1903, ...