On Thu, 27 May 2004 20:21:40 -0400, Tom Quackenbush wrote:
Kelly's already done a bang-up job of explaining why you need to
bring mass back into the picture.

Um. Hate to be practical and everything here, but if you're forcing
a gas into the gopher hole, the density doesn't matter; it's not going
there by gravity, it's going there by pressure. You could force
helium down there and it'd go down rather than up, density and
molecular mass notwithstanding.