Observable meaning

əb-zûr'və-bəl
Deserving or worthy of note; noteworthy.

An observable anniversary.

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A physical property, such as weight or temperature, that can be observed or measured directly, as distinguished from a quantity, such as work or entropy, that must be derived from observed quantities.
noun
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That can be observed; visible; discernible; noticeable.
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Deserving of attention; noteworthy.
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That can or must be kept or celebrated.

An observable holiday.

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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.
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Able to be observed.
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Deserving to be observed.
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(physics) Any physical property that can be observed and measured directly and not derived from other properties.

Temperature is an observable but entropy is derived.

In quantum mechanics, observables correspond to Hermitian operators. Also, they act a lot like random variables. Taking their average one may recover something resembling a classical observable.

noun
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Possible to observe.

Observable phenomena; an observable change in demeanor.

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