FACT

 A physical experiment is _not_ merely the observation

of a group of facts but also the reporting of these facts

via a symbolic language played by the rules of physical

theories. In this process of reporting the facts

are abstracted to the physical (scientific) facts via 

the physical theories which correlate the observed facts 

to the abstracted. In such a way the experimental set-up,

observation and the physical facts are governed via

the physical theories. 

Experiment is conducted according to the physical theories, 

and according to the physical theories it is decided 

what should be observed, 

and according to the physical theories it is reported 

what physical facts observed.