Heisenberg's uncertainty principle or just the uncertainty principle is a principle in quantum physics which states that there is a limit to how precisely we can measure a particle's position and momentum at a given time. Mathematically, it is stated as

$ \Delta x \Delta p \geq \frac{\hbar}{2} ~~ $

where ħ is the reduced Planck constant (or the Planck constant over 2π).

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