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spark chamber

(Encyclopedia)spark chamber, in physics, device for recording the passage of elementary particles produced by reactions in a particle accelerator. Particles pass through a stack of metal plates or wire grids that a...

Begin, Menachem

(Encyclopedia)Begin, Menachem mĕnäˈkhĕm bāˈgĭn [key], 1913–92, Zionist leader and Israeli prime minister (1977–83), b. Russia. He became (1938) leader of a Zionist youth movement in Poland, where he also...

Timor

(Encyclopedia)Timor tēˈmôr [key] [Malay,=east], island (1990 est. pop. 3,900,000), c.13,200 sq mi/34,200 sq km, largest and easternmost of the Lesser Sundas, in the Malay Archipelago. Timor is divided politicall...

adhesive

(Encyclopedia)adhesive, substance capable of sticking to surfaces of other substances and bonding them to one another. The term adhesive cement is sometimes used in place of adhesive, especially when referring to a...

ballistics

(Encyclopedia)ballistics bəlĭsˈtĭks [key], science of projectiles. Interior ballistics deals with the propulsion and the motion of a projectile within a gun or firing device. Its problems include the ignition a...

Randolph, Edmund

(Encyclopedia)Randolph, Edmund, 1753–1813, American statesman, b. Williamsburg, Va.; nephew of Peyton Randolph. He studied law under his father, John Randolph, a Loyalist who went to England at the outbreak of th...

shock absorber

(Encyclopedia)shock absorber, device for reducing the effect of a sudden shock by the dissipation of the shock's energy. On an automobile, springs and shock absorbers are mounted between the wheels and the frame. W...

dam

(Encyclopedia)dam, barrier, commonly across a watercourse, to hold back water, often forming a reservoir or lake; dams are also sometimes used to control or contain rockslides, mudflows, and the like in regions whe...

El Niño–Southern Oscillation

(Encyclopedia)El Niño–Southern Oscillation (ENSO) ĕl nēnˈyō [key], large-scale climatic fluctuation of the tropical Pacific Ocean and the overlying atmosphere. The El Niño [Span.,=the child] is the South Am...

liquid

(Encyclopedia)liquid, one of the three commonly recognized states in which matter occurs, i.e., that state, as distinguished from solid and gas, in which a substance has a definite volume but no definite shape. T...