Look at the possibilites

  • user25
    2nd Jun 2011 Member 0 Permalink
    http://en.wikipedia.org/wiki/Heavy_water

    Wikipedia:

    Heavy water is water highly enriched in the hydrogen isotope deuterium
  • airstrike52
    2nd Jun 2011 Member 0 Permalink
    Also, when you burn loads of hydrogen with oxygen, a few particles should be deuterium oxide, as deuterium is a naturally occurring, albeit uncommon, isotope of hydrogen.