observable -
capable of being seen or noticed; "a discernible change in attitude"; "a clearly evident erasure in the manuscript"; "an observable change in behavior"
noticeable capable or worthy of being perceived; "noticeable shadows under her eyes"; "noticeable for its vivid historical background"; "a noticeable lack of friendliness"
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.
OmegaWiki Dictionary
Ω
observable There to be observed.
observable Any physical property that can be observed and measured directly and not derived from other properties.
