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Several competing explanations exist and experiments have not yet chosen among them.","posed_since":"","precise":"Explain the growth of the isothermal compressibility $\\kappa_T$, the isobaric heat capacity $C_P$ and the magnitude of the thermal expansion coefficient $\\alpha_P$ in supercooled liquid water at ambient pressure down to about 230 K, distinguishing between the liquid-liquid critical point scenario, the singularity-free scenario, the critical-point-free scenario and the stability-limit conjecture. An answer is a thermodynamic model consistent with all measured response functions in the accessible range and with predictions that experiment can test.","problem_ref":null,"references":"","settled_by":"Measurements of response functions inside the region of rapid crystallization (230 to 160 K) at pressures up to $3e9\\,\\mathrm{dyn}/\\mathrm{cm}^2$, compared with each scenario's predictions.","status_note":"","title":"Origin of the thermodynamic anomalies of supercooled 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