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Amused that the article calls heavy water "a hydrogen-rich substance". As far as I'm aware it has exactly the same amount of hydrogen as regular water, by defin

Amused that the article calls heavy water "a hydrogen-rich substance". As far as I'm aware it has exactly the same amount of hydrogen as regular water, by definition. Presumably the author was going for "neutron-rich" but misremembered.

DuskStar 8y ago
It does have more hydrogen (by weight) than regular water, just not by moles.
- flashman 8y ago
  Correct. A greater fraction of its weight is hydrogen due to the extra neutron, but it contains the same number of hydrogen atoms. Heavy water masses 20g/mol versus 18g/mol for regular water.