Chemistry / Chem 0813 · Atom · ~20 seconds
The Heisenberg Uncertainty Principle
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The Heisenberg uncertainty principle states that a particle's exact position and momentum cannot both be known simultaneously, however precisely measured.
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Pinning an electron's position down more precisely makes its momentum less precisely knowable, and the reverse holds too.
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This limit is not an instrument flaw fixable by better technique — it is a fundamental limit on what is simultaneously knowable.