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Semiheavy or semi-heavy water is a useful term, but not a widespread one. It looks like HDO is a much more common term to refer to singly-deuterated water. (See ngram https://books.google.com/ngrams/graph?content=semiheavy%2C+semi-heavy%2C+HDO&year_start=1800&year_end=2019&corpus=26&smoothing=3) Meanwhile, sources like the IUPAC Gold Book and Oxford dictionaries define heavy water in a way that includes both HDO and D2O.DrPhlogiston (talk) 18:27, 22 April 2021 (UTC)
Freezing point
editIn comparing freezing point to that of heavy water, both numbers should be given to same number of significant figures. Was 3.80 intended? If not, 3.82 rounds to 3.8 and raise question whether they are actually different. Hebbgd (talk) 16:13, 12 February 2023 (UTC)