[hedgedoops2]

Nah.

If I understand the article correctly, they found a phase transition reaction, a chemical reaction that occurs in liquid water below 0 C that splits the body of liquid water into one continuous region of high density and one of low, so its no longer a uniform liquid.

This would also release heat, like the freezing reaction (and unlike random rearrangements of molecules in the liquid).

[hedgedoops2]

Okay thats wrong they didnt find that. Looks like just did some ml and it suggested that such a reaction exists and what the two species are.

Also its unclear whether during the phase transition there really is two seperate macroscopic regions as opposed to a mixture (maybe like a suspension)

[hedgedoops2]

You should still be able to confirm it with calorimetry though I guess?

I'm confused about this.