uncertainty principle | Werner Heisenberg | it is impossible to measure an atomic or nuclear process without at the same time disturbing or altering the process. | The principle that the fundamental uncertainty in a variable times that in its canonical conjugate is of the order of Planck's constant. | Relation | Conjugates |
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ΔxΔp ≥ h | position, momentum | ΔEΔt ≥ h | energy, time |
| the microscopic realm is a roiling frenzy, awash in a violent sea of quantum fluctuations. | the uncertainty in the measurement of the position of an electron varies inversely as the uncertainty in the measurement of its momentum. | Heisenberg uncertainty principle | | quantum law |