Theory 08/Molecular & anomalous/Viscosity
Viscosity Dips Where Cages Collapse
The claim
Water's viscosity minimum with pressure is set by the ratio of cage collapse to bond breaking, so viscosity falls before it rises as pressure increases.
01Mechanism
Pressure collapses the open structure, increasing packing and easing flow, until compression starts to hinder it.
02Prediction
The minimum should track the ratio.
03Refutation
Monotonic viscosity with pressure would remove cage collapse.