# The System and the Measuring Gadget

In Quantum Mechanics the value of an observable results from the interaction between the "system" with the "Measuring gadget".

But when the experimenter[or the technologist concerned] is devising/constructing the gadget he has a view the "system" with its stand alone properties/attributes.It seems to be so.

But theory itself cannot ascribe the value of some observable to the system alone. How does one explain this?

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Information leaks out of the system----this information "leaked" is indicative of properties of the system $independent{\;} of{\;} the{\;} environment$ . The leaked information gets modified by interaction with the environment,the gadget being a part of it.Is it possible to eliminate the effect of the environment in the process of measurement? – Anamitra Palit Aug 3 '12 at 0:56