# Reality Revision 1.51 — Bubble Observation Fibers

Matter Harmony Lab 0.8.0 corrects the temptation to treat one bubble tone as a
point estimate of geometry.  The release-0.7 value 4110.9205 Hz remains correct
inside its declared ideal Minnaert assumptions.  Adding ordinary
small-amplitude vapor-pressure and surface-tension terms gives 4048.9557 Hz for
the same 0.800 mm bubble when the effective polytropic exponent is fixed at
1.4, a 1.5073% shift.  Allowing the bounded sensitivity interval
\(1\le\kappa\le1.4\) widens the radius compatible with the old pitch to
0.6659558--0.7879498 mm.

This is not merely parameter uncertainty.  The engine constructs 401 distinct
\((\kappa,R,\varepsilon)\) states with the same carrier and oscillating-volume
scale.  The two endpoint pressure traces agree within
\(3.667\times10^{-16}\) Pa over 3,840 samples.  The local inverse has rank three
for four parameters, leaving one null direction.  Thus the complete pressure
waveform in this bounded model identifies an observation fiber, not a unique
bubble state.

All 88 tests pass, and an independent scalar replay checks all 401 states and
7,680 endpoint samples.  These are written mathematics and finite synthetic
tests, not measured water-drop evidence.  The effective thermal law,
free-surface correction, damping decomposition, nonsphericity, multibubble
coupling, and air-transfer path remain unresolved.  The next experiment must
add synchronized radius/depth imaging and calibrated underwater plus airborne
pressure; an unexplained residual still cannot identify an extra dimension or
theological cause.