The Two Fluids Postulated: Tisza's Superfluid Helium, Priced

In 1938 Laszlo Tisza postulated that helium II is two interpenetrating fluids — a superfluid component of zero entropy and zero viscosity and a normal component carrying all the entropy and viscosity, with independent velocity fields and densities summing to the whole — and from that postulate predicted that heat in helium II propagates as a wave: second sound. I credit those papers at full strength: Peshkov observed second sound in 1944, the two-fluid hydrodynamics organised the capillary-flow, oscillating-disc and fountain-effect experiments no single-fluid picture reconciled, and the model remains the working hydrodynamics of superfluid helium. My own bench re-returns the model's propagating thermal mode at the declared inputs, in the helium-II range. Nothing in this paper falsifies second sound or the hydrodynamics. What I price is the decomposition itself. No step in 1938 derives the split from the liquid's microscopic constitution, and the split fraction ρ_s/ρ(T) is carried as an experimentally supplied function, not a 1938 output. My bench prices that input on declared inputs only. With the split fraction frozen at r = 0.500 the model's own formula u₂² = (ρ_s/ρ_n)(S²T/C) rises monotonically from 1.677051 to 14.209964 m/s, while with the split supplied it falls overall from 16.686447 m/s (T = 1.00 K, r = 0.99, ρ_s/ρ_n = 99.000000, F = 2.812500) to 6.657671 m/s (T = 2.10 K, r = 0.18, ρ_s/ρ_n = 0.219512, F = 201.923077) — the curve's shape is the input function's — and at the cold end the elasticity 1/(2(1−r)) reaches 50.000000, so the headline speed is fifty times as sensitive as the input that manufactures it. Counted plainly: 1 postulated decomposition against 0 derivations in 1938. Grade for this census entry, printed at full size: **REASON FOUND / STILL TURNING** — PREMISE-ONLY, explicitly not a kill and not a falsification. The program headline stands unmoved: **vacuum catastrophe NOT SOLVED / PARTIAL, producing-count 0.**