Mike Stay wrote: << It separates things by density, not mass. On Tue, Apr 29, 2008 at 6:50 PM, Dan Asimov <dasimov@earthlink.net> wrote:

Mike Speciner wrote:

<< [quote of passage from NY Times article that Mike evidently considers erroneous]

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Mike, I don't recall if I ever understood just how centrifuges work. Would you be so kind as to explain?

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Hmm, guess I did know that, at least intuitively. SO -- since the article discusses using centrifuges to separate isotopes of uranium in gaseous form: How does one define the density of a single molecule? (Especially considering that it has no boundary, but rather a gradually attenuating force field.) --Dan _____________________________________________________________________ "It don't mean a thing if it ain't got that certain je ne sais quoi." --Peter Schickele