Columbia Encyclopedia

Search results

500 results found

compression

(Encyclopedia)compression, external stress applied to an object or substance, tending to cause a decrease in volume (see pressure). Gases can be compressed easily, solids and liquids to a very small degree if at al...

condensation

(Encyclopedia)condensation, in physics, change of a substance from the gaseous (vapor) to the liquid state (see states of matter). Condensation is the reverse of vaporization, or change from liquid to gas. It can b...

snakebite

(Encyclopedia)snakebite, wound inflicted by the teeth of a snake. The bite of a nonvenomous snake is rarely serious. Venomous snakes have fangs, hollow teeth through which poison is injected into a victim. All type...

treaty port

(Encyclopedia)treaty port, port opened to foreign trade by a treaty. The term is usually confined to ports in those countries that formerly strongly objected to foreign trade or attempted altogether to exclude it. ...

pruning

(Encyclopedia)pruning, the horticultural practice of cutting away an unwanted, unnecessary, or undesirable plant part, used most often on trees, shrubs, hedges, and woody vines. Man uses pruning to remove diseased ...

Nenets Autonomous Area

(Encyclopedia)Nenets Autonomous Area nyĕˈnyĭts [key], administrative division (1990 est. pop. 55,000), 68,224 sq mi (176,700 sq km), extreme NE European Russia. Formed in 1929, the area forms the northern part o...

Slim Helú, Carlos

(Encyclopedia)Slim Helú, Carlos cärˈlōs slēm hēlo͞oˈ [key], 1940–, Mexican business executive. The son of a Lebanese Maronite immigrant who became a successful merchant and real-estate investor, Slim was ...

Zelaya Rosales, José Manuel

(Encyclopedia)Zelaya Rosales, José Manuel hōsāˈ mänwĕlˈ sālīˈä rōsäˈlās [key], 1952–, Honduran political leader. A businessman and rancher, he joined the Liberal party of Honduras (PLH) in 1970. He...

Canada Act

(Encyclopedia)Canada Act, also called the Constitutional Act of 1982, which made Canada a fully sovereign state. The British Parliament approved it on Mar. 25, 1982, and Queen Elizabeth II proclaimed it on Apr. 17,...

liquid air

(Encyclopedia)liquid air, ordinary air that has been liquefied by compression and cooling to extremely low temperatures (see liquefaction). Its commercial preparation involves purification by washing to remove solu...