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Мда, тия дефиниции са много хубави, но да чуем Айнщайн:
"It followed from the special theory of relativity that mass and energy are both but different manifestations of the same thing..."
И малко обяснения откъде идват недоразумения при разбиране на еквивалентността на маса и енергия. Изказвания, базирани на определенията и представите, които са в линковете по-горе, могат доста да объркат. Така че се извинявам за смелото им цитиране в контекста на темата.
"Energy, the thing that's conserved, is not the "energy" of common usage, which is a concept from the days of Aristotle and the thing related to food and fuel which keeps us alive and keeps our engines running. Mass is not weight, is not quantity of substance, and is certainly not volume (recall, we do determine the quantity of gasoline and ice cream by volume).
Both mass and energy are rather abstract quantities that we know how to calculate in a variety of situations and something that, when everything affected is taken into account, has the same value when all the little pieces are added up—no matter what. That's "something" not "some things" because they are the same "thing."
"Einstein's energy-mass equivalence, E = mc², is an equivalence in the sense of formal logic. It is very often mistakenly seen as a mutual exclusion in which we observe mass vanishing and energy taking its place, or vice versa.
"Mass," "weight," "matter" (and sometimes even "volume") are pervasively and persistently confused with each other. They are seen as being, vaguely, quantity-of-substance, but without differentiating between the more abstract (read "subtle," perhaps) concepts the terms mean in science."
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Re: какво е опредлението за "енергия"? [re: нaив]
