Tom writes: << The molecular size and charge distribution is almost identical, so the crystals form without distinguishing between H2O and DH2O. It would be rare to find any significant number of molecules of D2O. DH2O ice does not sink, in any case.

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I'm confused. Does DH2O mean DHO (one deuterium, one hydrogen, one oxygen)? (If not, please define. If so, why the 2 ?) --Dan