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The density maximum of water dominates the thermodynamics of the system under ambient conditions, is strongly  P -dependent, and disappears at a crossover pressure  P  cross  ~ 1.8 kbar. We study this variable across a wide area of the  T – P  phase diagram. We consider old and new data of both the isothermal compressibility  K T  ( T ,  P ) and the coefficient of thermal expansion  α P  ( T ,  P ). We observe that  K T  ( T ) shows a minimum at  T * ~ 315±5 K for all the studied pressures. We find the behavior of  α P   to also be surprising: all the  α P  ( T ) curves measured at different  P  cross at  T *. The experimental data show a “singular and universal expansivity point” at  T * ~ 315 K and  α P  ( T *) ≃ 0.44 10 −3   K  −1 . Unlike other water singularities, we find this temperature to be thermodynamically consistent in the relationship connecting the two response functions.

A singular thermodynamically consistent temperature at the origin of the anomalous behavior of liquid water