Scientists Discover Hidden State of Water, Challenging Physical Limits
Researchers have confirmed the existence of a hidden critical point in supercooled water, where it can exist in two distinct liquid forms that merge under extreme cold and pressure. This discovery, made using an X-ray free-electron laser, helps explain water's unique properties, such as its high surface tension and density anomalies. The critical point, known as the liquid-liquid critical point (LLCP), occurs at around -63 degrees Celsius and under immense pressure. This finding supports the hypothesis that water's unusual behavior is due to its ability to exist in two phases, a high-density liquid and a low-density liquid, which merge at the LLCP. 
