This manuscript presents a cross‑domain predictive validation of the ACE–CPG mechanism by demonstrating that the compression–impedance signature extracted from superfluid Helium‑II successfully predicts the thermodynamic behaviour of water at its critical point. In earlier work, the Helium‑II molecular ledger revealed a unified structural pattern linking entropy collapse, compressibility behaviour, coherence growth, and gravitational impedance reduction. Before examining any water data, this Helium‑II signature was used to generate a forward prediction: if the ACE mechanism is universal, then water at the critical point must exhibit the same structural behaviour. Using official IAPWS‑95 and NIST datasets, this prediction is confirmed. Water near 647 K displays the same entropy reorganisation, the same divergence in compressibility, the same growth of correlation length, and the same entry into a low‑impedance state. Despite belonging to different physical regimes — one quantum, one classical — both systems follow the same compression‑phase structure. The results demonstrate that entropy, compressibility, coherence, and impedance form a unified transition across domains, and that gravitational coupling depends systematically on internal ordering. This work provides strong evidence that the ACE–CPG framework captures a universal physical mechanism underlying critical phenomena.
Michael Acris (Fri,) studied this question.