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- Dictionaryuncertainty principle
noun
- 1. the principle that the momentum and position of a particle cannot both be precisely determined at the same time.
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The uncertainty principle, also known as Heisenberg's indeterminacy principle, is a fundamental concept in quantum mechanics. It states that there is a limit to the precision with which certain pairs of physical properties, such as position and momentum, can be simultaneously known. In other words, the more accurately one property is measured, the less accurately the other property can be known. Wikipedia