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/djuːˈtɪəɹɪəm/ · noun
(uncountable, physics) An isotope of hydrogen with one proton and one neutron in each atom - 21H..
Heavy water is "heavy" because it contains deuterium.
There were about 80 deuteriums for every million protiums, and virtually no tritium.
Use deuterium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Deuterium means (uncountable, physics) An isotope of hydrogen with one proton and one neutron in each atom - 21H..
Common synonyms include mul:H-2, mul:²H, hydrogen-2, hydrogen 2.
The opposite depends on the specific sense.
Heavy water is "heavy" because it contains deuterium.
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