[uh b-zur-vuh-buh l] /əbˈzɜr və bəl/

capable of being or liable to be ; noticeable; visible; discernible:
an observable change in attitude.
worthy or important enough to be celebrated, followed, or :
an observable holiday.
deserving of attention; noteworthy.

c.1600, from Latin observabilis “remarkable, observable,” from observare (see observe). Related: Observably; observability.
A measurable property of a physical system, such as mass or momentum. In quantum mechanics, observables correspond to mathematical operators used in the calculation of measurable quantities. Operators that do not commute, having a nonzero commutator, correspond to observables that cannot be precisely measured at the same time, such as momentum and position. See also uncertainty principle.


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