A new Nature Physics study has shed light on the long-hypothesized liquid-liquid critical point where water simultaneously exists in two distinct liquid forms, opening new possibilities for experimental validation.

Water is known for its anomalous properties—unlike most substances, water is densest in its liquid state, not solid. This leads to unique behaviors such as ice floating on water.

One of several such unusual characteristics has prompted decades of research to understand water’s unique behavior, particularly in the supercooled regime.