## OBSERVABLE

### Observable

In physics, particularly in quantum physics, a system**observable**is a measurable operator, or gauge, where the property of the system state can be determined by some sequence of physical operations. For example, these operations might involve submitting the system to various electromagnetic fields and eventually reading a value off some gauge. In systems governed by classical mechanics, any experimentally observable value can be shown to be given by a real-valued function on the set of all possible system states.

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### observable

#### Noun

- 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**.

#### Adjective

*The above text is a snippet from Wiktionary: observable*

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