Columbia Encyclopedia

Search results

500 results found

perpetual-motion machine

(Encyclopedia)perpetual-motion machine, device that would be able to operate continuously and supply useful work, in violation of the laws of thermodynamics. A machine that would produce more energy in the form of ...

work

(Encyclopedia)work, in physics and mechanics, transfer of energy by a force acting to displace a body. Work is equal to the product of the force and the distance through which it produces movement. Although both fo...

Cockcroft, Sir John Douglas

(Encyclopedia)Cockcroft, Sir John Douglas, 1897–1967, English physicist, educated at the Univ. of Manchester and St. John's College, Cambridge. He was a fellow of St. John's College (1928–46) and professor of n...

voltaic cell

(Encyclopedia)voltaic cell, a simple device with which chemical energy is converted into electrical energy. Two dissimilar metals (e.g., copper and zinc) are immersed in an electrolyte (e.g., a dissolved sulfate). ...

breakwater

(Encyclopedia)breakwater, offshore structure to protect a harbor from wave energy or deflect currents. When it also serves as a pier, it is called a quay; when covered by a roadway it is called a mole. In the Unite...

Baruch, Bernard Mannes

(Encyclopedia)Baruch, Bernard Mannes bəro͞okˈ [key], 1870–1965, U.S. financier and government adviser, b. Camden, S.C. He grew rich through stockmarket speculation before he was 30. In World War I he advised o...

Euratom

(Encyclopedia)Euratom: see European Atomic Energy Community. ...

Bush, George Walker

(Encyclopedia)Bush, George Walker, 1946–, 43d President of the United States (2001–9), b. New Haven, Conn. The eldest son of President George H. W. Bush, he was was raised in Texas and, like his father, attende...

Port Augusta

(Encyclopedia)Port Augusta, city (2016 pop. 13,808), South Australia, S Australia, at the head of Spencer Gulf. It is a railroad center and a center for solar and other renewable energy. ...

heat

(Encyclopedia)heat, nonmechanical energy in transit, associated with differences in temperature between a system and its surroundings or between parts of the same system. The study of heat and its relationship ...