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In [[physics]], '''conjugate variables''' are pairs of variables that share an [[uncertainty principle|uncertainty relation]]. The terminology comes from classical [[Hamiltonian mechanics]], but also appears in [[quantum mechanics]] and engineering.
Examples of canonically conjugate
* Time and frequency: the longer a musical note is sustained, the more precise we know its frequency (but it spans more time). Conversely, a very short musical note becomes just a click, and so one can't know its frequency very accurately.
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