Changes

'''Heavy water''', (chemical formula: ²[[Hydrogen|H]]₂[[Oxygen|O]], or [[Deuterium|D]]₂[[Oxygen|O]]) or '''deuterated water''', is [[water]] in which one or both of the [[hydrogen]] atoms in the water molecule has been replaced by [[deuterium]].

'''Heavy water''' in the narrower sense is [[water]] that consists of water molecules of  the chemical formula ²[[Hydrogen|H]]₂[[Oxygen|O]] (or [[Deuterium|D]]₂[[Oxygen|O]]): Both hydrogen atoms in the molecules are "heavy hydrogen" i.e. [[deuterium]] atoms. This molecule is called ''heavy water'' (molecule), ''deuterium oxide'', ''deuterated water'' or ''water-d2''.<ref>[https://pubchem.ncbi.nlm.nih.gov/compound/Water-d2 Deuterium oxide (water-d2)]</ref> If there is one normal hydrogen and  one deuterium atom in the molecule (formula HDO) then it is called ''semiheavy water'' (molecule) or ''water-d1''.<ref>[https://pubchem.ncbi.nlm.nih.gov/compound/Water-d1 Water-d1]</ref>

== Properties ==

== Properties ==

However, being [[flammable]] makes [[graphite]] more dangerous to use.  The most dramatic example of this danger is the disaster at the [[Chernobyl]] power plant.  A mishap in a plant using heavy water can theoretically be a "self-solving problem," as it is non-flammable.

However, being [[flammable]] makes [[graphite]] more dangerous to use.  The most dramatic example of this danger is the disaster at the [[Chernobyl]] power plant.  A mishap in a plant using heavy water can theoretically be a "self-solving problem," as it is non-flammable.

[[Category:Chemistry]]

[[Category:Chemistry]]