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Physics, and in general science, is all about developing "models" that we hope fit to physical reality as much as possible. Fitting criteria are explanation of current observation (that is not necessarily the pure reality in its essence as the observation might well be restricted by not only the instruments but also the current paradigm and ...


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A few thoughts: -do all of these conceptual questions still cause difficulties if everything is expressed purely in mathematical terms and in full without abbreviations? I don't have the right typeset on my computer but, for example, I think that if you typed out the formula for mean velocity in full it would be quite clear what is meant by saying that it ...


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