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On Nov 30, 2007, at 1:40 PM, John Denker wrote:
There is an abstract notion of conservative flow that
is /approximately/ realized by flowing water and very
very /precisely/ realized by energy. As previously
explained, we don't say the flow of water "is" the
flow of energy, but certainly the flow of water is
_like_ the flow of energy. No analogy is perfect,
but this analogy has tremendous conceptual and
pedagogical power.