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2 answers

It is available energy that can be extracted from a system. It's not free from a sense of coming from nothing. It's free in the sense of being free to participate in doing work.

2007-03-08 04:06:10 · answer #1 · answered by Gene 7 · 1 0

TANSTAAFL

2007-03-08 12:26:44 · answer #2 · answered by Iridflare 7 · 0 1

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