Controversy continues over whether hot water freezes faster than cold
I searched for "mass" and "dens" and didn't find anyone mentioning this, so: Note that hot water is less dense than cold water.  Therefore, an "equal volume" of hot water contains less mass than the same volume of cold water.  The article mentions 35°C vs 100°C; going by <a href="https://www.usgs.gov/special-topics/water-science-school/science/water-density" rel="nofollow">https://www.usgs.gov/special-topics/water-science-school/sci...</a> and interpolating, it looks like the density difference would be about 3.6%.  That seems worth mentioning, even if it's not a large effect.<p>Also, if some of the water starts at 100°C, then presumably some of it will evaporate, and one should measure how much remains... The article does mention <i>this</i> possibility, though it doesn't evaluate or quantify it.