Uncertainty-principle meaning

ŭn-sûrtn-tē
A principle in quantum mechanics holding that greater accuracy of measurement for one observable quantity entails less accuracy of measurement for another conjugate quantity.
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In quantum mechanics, the principle that it is impossible to measure simultaneously and exactly two related quantities, as both the position and the momentum of an electron.
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A principle, especially as formulated in quantum mechanics, that greater accuracy of measurement for one observable entails less accuracy of measurement for another. For example, it is in principle impossible to measure both the momentum and the position of a particle at the same time with perfect accuracy. Any pair of observables whose operators do not commute have this property. As defined in quantum mechanics, it is also called Heisenberg's uncertainty principle. Similar uncertainty principles hold for non-quantum mechanical systems involving waves as well.
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(quantum mechanics) Heisenberg uncertainty principle.
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