Why physicists never say: ‘potential mass/energy E=Mc^2’?

Why physicists never say: ‘potential mass/energy E=Mc^2’?

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My opinion.

In Classic physics there is ‘ potential energy’ and
there is ‘ kinetic energy’.
And „The Law of Conservation and Transformation of
Energy/ Mass" connects them together.

In Quantum physics the ’rest mass/enegy’ looks as a static factor.
I think that there is problem here.
Because in QT there is ’rest mass/enegy E=Mc^2’ and
there is active / kinetic energy E=hf. But how „The Law of
Conservation and Transformation of Energy/ Mass"
can unite them together nobody explains.

In other words:
Dont know how to explain transforms the potenial
mass/enegy E=Mc^2 into the active / kinetic energy E=hf
the physicsts began to use new terminology and new words.
================== . .
Best wishes.
Israel Sadovnik. / Socratus.


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