In this video, he says that water has four properties (surface tension, refractive index... ) that transition from 50 - 63 Celsius between totally separate values? Eminently testable but I don't have the facilities. I tried searching but there some statements of liquid water having two phases but related to supercooled water. What experimental evidence is there that water has 2 phases and a transition occurs at 50C?

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    $\begingroup$ Sounds like nonsense. $\endgroup$ – Ivan Neretin Jan 9 at 23:12
  • $\begingroup$ @Ivan Neretin, The video is non-sense, but the report in Science on the two states of supercooled water is not. The video is apparently made on this paper. The title of the paper "Experimental observation of the liquid-liquid transition in bulk supercooled water under pressure." There are no two phases like hexane and water mixtures, but some transitions were observed at nano to microsecond timescales. $\endgroup$ – M. Farooq Jan 10 at 1:02

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