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latent heat

(Encyclopedia)latent heat, heat change associated with a change of state or phase (see states of matter). Latent heat, also called heat of transformation, is the heat given up or absorbed by a unit mass of a substa...

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...

photon

(Encyclopedia)photon fōˈtŏn [key], the particle composing light and other forms of electromagnetic radiation, sometimes called light quantum. The photon has no charge and no mass. About the beginning of the 20th...

vibration

(Encyclopedia)vibration, in physics, commonly an oscillatory motion—a movement first in one direction and then back again in the opposite direction. It is exhibited, for example, by a swinging pendulum, by the pr...

Cash, Johnny

(Encyclopedia)Cash, Johnny, 1932–2003, American singer and songwriter, b. Kingsland, Ark. Born to a farm family, he went to Memphis in 1955 and recorded such hits as “I Walk the Line” (1956) and “Ring of Fi...

Beattie, Ann

(Encyclopedia)Beattie, Ann bēˈtē, bāˈ– [key], 1947–, American writer, b. Washington, D.C. She gained attention in the early 1970s with short stories in the New Yorker; the 48 stories she published (1974–...

water beetle

(Encyclopedia)water beetle, name for aquatic beetles of several families. They should not be confused with water bugs, which are true bugs (order Hemiptera). The predaceous diving beetles (family Dytiscidae) are a ...

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...

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...

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...