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convection

(Encyclopedia)convection, mode of heat transfer in fluids (liquids and gases). Convection depends on the fact that, in general, fluids expand when heated and thus undergo a decrease in density (since a given volume...

crane, in zoology

(Encyclopedia)crane, large wading bird found in marshes in the Northern Hemisphere and in Africa. Although sometimes confused with herons, cranes are more closely related to rails and limpkins. Cranes are known for...

Urban II

(Encyclopedia)Urban II, c.1042–1099, pope (1088–99), a Frenchman named Odo (or Eudes) of Lagery; successor of Victor III. He studied at Reims and became a monk at Cluny. He went to Rome, as prior of Cluny, earl...

Quine, W. V.

(Encyclopedia)Quine, W. V. (Willard Van Orman Quine) kwīn [key], 1908–2000, American philosopher and mathematical logician, b. Akron, Ohio, grad. Oberlin, 1930. He studied at Harvard (Ph.D., 1932) under Alfred N...

Olbers, Heinrich Wilhelm Matthäus

(Encyclopedia)Olbers, Heinrich Wilhelm Matthäus hīnˈrĭkh vĭlˈhĕlm mätĕˈo͝os ôlˈbərs [key], 1758–1840, German astronomer and physician. He originated (1797) the first satisfactory method for calculat...

gas

(Encyclopedia)gas, in physics, one of the three commonly recognized states of matter, the other two being solid and liquid. A substance in the gaseous state has neither definite shape nor definite volume. Like liqu...

appendix

(Encyclopedia)appendix, small, worm-shaped blind tube, about 3 in. (7.6 cm) long and 1⁄4 in. to 1 in. (.64–2.54 cm) thick, projecting from the cecum (part of the large intestine) on the right side of the lower ...

snapping turtle

(Encyclopedia)snapping turtle, large, aggressive New World freshwater turtle. The two snapping turtle species are the sole members of the family Chelydridae. Snapping turtles prefer quiet, muddy water. They spend m...

Pérez, Antonio

(Encyclopedia)Pérez, Antonio äntôˈnyō pāˈrĕth [key], b. 1534 or 1539, d. 1611, Spanish politician. Ambitious and unscrupulous, he became secretary to King Philip II and was, with the princesa de Éboli, a c...

phase diagram

(Encyclopedia)CE5 Phase diagram for a substance, like water, which expands on freezing phase diagram, graph that shows the relation between the solid, liquid, and gaseous states of a substance (see states of ma...