observable quantity

observable quantity

[əb′zər·və·bəl ′kwän·əd·ē]
(physics)
A measurable physical quantity.
References in periodicals archive ?
You can put a sensor in the presence of the measurable quantity, and, as that quantity changes, the sensor puts out an analog signal, whose electronic amplitude matches the strength of the observable quantity at any given moment.
The strength of the observable quantity is made to alter the phase of a passing electronic signal, a carrier wave.