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I model neither energy nor charge as substances; they are calculated,
mathematical quantities - like scores that one tallies in a game. I have
exposed the pitfalls of energy reification in the past on this list.
However, I do find it useful to apply some of the properties of substances
to mathematical entities, either as metaphors or simply by recognizing a
commonly accepted widened use of certain words (institutionalized
metaphors?). For example, I find it more than a metaphor to apply the
ability to "flow" to any mathematical quantity which obeys the diffusion
equation....
Bob Sciamanda (W3NLV)