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WordReference Random House Unabridged Dictionary of American English © 2024uncer′tainty prin′ciple, [Physics.]- Physicsthe principle of quantum mechanics, formulated by Heisenberg, that the accurate measurement of one of two related, observable quantities, as position and momentum or energy and time, produces uncertainties in the measurement of the other, such that the product of the uncertainties of both quantities is equal to or greater than h/ 2π, where h equals Planck's constant. Also called indeterminacy principle, Heisenberg uncertainty principle.
Collins Concise English Dictionary © HarperCollins Publishers:: uncertainty principle n - the principle that energy and time or position and momentum of a quantum mechanical system, cannot both be accurately measured simultaneously. The product of their uncertainties is always greater than or of the order of h, where h is the Planck constant
Also known as: Heisenberg uncertainty principle, indeterminacy principle
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