Originally posted by Tom
Boy, are you guys confused.
Actually I was hoping someone would step in who can speak with authority. I’ve been trying to pick a fight to test my understanding of something. If you will tolerate it, let me challenge you a bit to see what comes out of it.
You say, "Energy is a defined mathematical quantity. It has no physical reality apart from its functional dependence on state variables that do have reality."
At the old PF, Integral said this too, basically saying that energy is a means of measurement. So when you say “state variables that do have reality,” aren’t you meaning by the term “reality,” that which can be observed, measured, and quantified? Does energy fail to qualify for that (i.e., reality) because only energy’s
effects can be seen (work), while energy itself (whatever that is) is unobservable, immeasurable, and unquantifiable?
Originally posted by Tom In a dynamical physical system, the state of the system at a given instant is a sort of snapshot of the system, determined by the complete set of state variables. The energy of the state is nothing more than a number associated with the state, calculated by means of rules that associate state variables with forms of energy.
Got it. But building on my previous point, is it that energy is “nothing,” or is it that energy is unobservable, immeasurable, and unquantifiable? You know it is “real” because you can see its effect on things, but for the sake of predicting and working in physics you have to find a way to observe, measure, and quantify. Since energy is contrary to that, you observe, measure, and quantify its effects on things.
Originally posted by Tom
Actually, we should not "see" energy at all. We do not measure energy, we measure the values of state variables. What we "see" is light with a lower frequency, and from that information we calculate its energy to be lower.
That seems to agree with my line of reasoning.
Originally posted by Tom
It agree that the statement "light is energy" is false. Rather, light has[/color] an energy that can be calculated.
This is why I picked the fight. A number of people have been saying that energy is light. I used to think so too, until I realized light can be more, or less, energized. To me it is illogical that light can gain or lose energy without losing base characteristics, like c or oscillation. In every other instance where energy is required to move something, energy is expended. But light travels at c no matter what its energy. Therefore, energy is not responsible for c; c must be related to something else altogether.
It is harder to make the case with oscillation (as a base characteristic of light) because it does slow and elongate in lower energy states. My argument there is that maybe light has a “base state” of vibrancy which energy is exaggerating. Since oscillation frequency increases as the wavelength shortens, then possibly “energy” is potentialized by compression of the base state of light, and made available for work when it decompresses.
Originally posted by Tom
Actually, since energy is a simple matter of mathematical definition, we do know exactly what it is.
That’s the only thing you said I can’t see. If you assign a definition or a number to something, that is just its representative. You may understand the representative system you’ve set up, but it doesn’t mean you understand that which it represents.