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Model estimates disagree by tens of kelvin and by thousands of atmospheres.","posed_since":"","precise":"Assuming the LLCP exists, determine $(T_{c}, P_{c})$ for $\\mathrm{H_2O}$. Published model results and extrapolations from experiment span roughly $T_{c} = 170 \\text{ to } 230\\,\\mathrm{K}$ and $P_{c}$ from about $0 \\text{ to } 2 \\times 10^{9}\\,\\mathrm{dyn}/\\mathrm{cm}^{2}$ ($0 \\text{ to } 2\\,\\mathrm{kbar}$), all approximate. An answer is a measured or reliably computed $(T_{c}, P_{c})$ with error bars, consistent with thermodynamic data at accessible conditions.","problem_ref":"ab24ab5039676ea09cea6242356dc65d0fdd628b5014271d9b0d8b6f1be12037","references":"","settled_by":"Experimental location of the LLCP, or first-principles simulations including nuclear quantum effects whose predictions match measured response functions of supercooled water.","status_note":"A 2026 ultrafast X-ray experiment placed the critical temperature near $210 \\pm 8\\,\\mathrm{K}$ (You et al., Science 2026); the critical pressure and an independent confirmation remain open.","title":"Location of water's liquid-liquid critical 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