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Noun
1. observable (measurable physical quantity)Physics
Wikipedia definition
2. ObservableIn physics, particularly in quantum physics, a system observable is a property of the system state that 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.
Read “Observable” on English Wikipedia
Read “オブザーバブル” on Japanese Wikipedia
Read “Observable” on DBpedia

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