If anything is physically existent, it can well be considered (1) as matter and energy, because these two are inter-convertible, and (2) as either matter or energy, since these are the two most basic states of physical existents.

But the mass of matter-energy is considered as a quantity, and energy too is considered as a quantity. In these cases, the former manner of considering matter and energy as physical existents is kept away from consideration. Instead, the circumstantially possible measure of matter-energy together is taken as mass, and the circumstantially possible measure of energy alone is considered as energy. Thus, mass and energy may be considered as a pair of quantities too.

How to differentiate these two aspects of doing physical science? How to reconcile them? Note that existent matter and energy as such are not separately and respectively being treated to correspond to the quantitative concepts of mass and energy. We have, as a result, many confusions in physics and in the philosophy of physics. Famously, the difficulty to define mass and energy as quantities might issue from the above discrepancy.

I invite your well-considered viewpoints. Merely holding that physics is such and that we need not ask such questions at all -- such is not the attitude from which the above questions are asked here. Do we have fundamental solutions for these questions?

Raphael Neelamkavil

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