- equivalence principle
(in relativity) the principle that, in any small region of space-time, the effects of a gravitational field are indistinguishable from those of an appropriate acceleration of the frame of reference. Also called Einstein's equivalency principle, principle of equivalence.[1915-20]
* * *Fundamental principle of physics that in its weak form states that gravitational (see gravitation) and inertial (see inertia) masses are the same.Albert Einstein's stronger version states that gravitation and acceleration are indistinguishable. It implies that the effect of gravity is removed in a suitably accelerated reference frame, such as an elevator with its cable cut, in which a person would experience free fall.
* * *▪ physicsfundamental law of physics that states that gravitational (gravitation) and inertial forces are of a similar nature and often indistinguishable. In the Newtonian form it asserts, in effect, that, within a windowless laboratory freely falling in a uniform gravitational field, experimenters would be unaware that the laboratory is in a state of nonuniform motion. All dynamical experiments yield the same results as obtained in an inertial state of uniform motion unaffected by gravity. This was confirmed to a high degree of precision by an experiment conducted by the Hungarian physicist Roland Eötvös (Eötvös, Roland, Baron von). In Einstein's version, the principle asserts that in free-fall the effect of gravity is totally abolished in all possible experiments and general relativity reduces to special relativity, as in the inertial state.
* * *
Look at other dictionaries:
Equivalence principle — General relativity|cTopic=Fundamental conceptsThe equivalence principle is one of the fundamental background concepts of the General Theory of Relativity. For the overall context, see General relativity.In the physics of relativity, the… … Wikipedia
equivalence principle — ekvivalentiškumo principas statusas T sritis fizika atitikmenys: angl. equivalence principle vok. Äquivalenzprinzip, n rus. принцип эквивалентности, m pranc. principe d’équivalence, m … Fizikos terminų žodynas
equivalence principle — noun : principle of equivalence … Useful english dictionary
equivalence principle — noun any of several principles, in relativity, concerned with the uniformity of physical measurements in different frames of reference … Wiktionary
equivalence principle of Einstein — Einšteino ekvivalentiškumo principas statusas T sritis fizika atitikmenys: angl. equivalence principle of Einstein vok. Einsteinsches Äquivalenzprinzip, n rus. принцип эквивалентности Эйнштейна, m pranc. principe d’équivalence d’Einstein, m … Fizikos terminų žodynas
strong equivalence principle — noun the principle that the laws of gravity are independent of velocity and position … Wiktionary
Equivalence — or equivalent may refer to: In chemistry: Equivalent (chemistry) Equivalence point Equivalent weight In computing: Turing equivalence (theory of computation) In ethics: Moral equivalence In history: The Equivalent, a sum paid from England to… … Wikipedia
principle of equivalence — noun (physics) the principle that an observer has no way of distinguishing whether his laboratory is in a uniform gravitational field or is in an accelerated frame of reference • Topics: ↑physics, ↑natural philosophy • Hypernyms: ↑principle,… … Useful english dictionary
principle — /prin seuh peuhl/, n. 1. an accepted or professed rule of action or conduct: a person of good moral principles. 2. a fundamental, primary, or general law or truth from which others are derived: the principles of modern physics. 3. a fundamental… … Universalium
principle of equivalence — Physics. See equivalence principle. * * * … Universalium