observation · WFC ·
Scotchn cell geometry: 12 mm OD inner / 15 mm ID outer / 75 mm, εr≈78 → C_geo 1.4585 nF; wet/dry ≈ εr ratio test adopted to separate geometric C from ionic/EDL meter artifact
Scotchn, Discord #neuralstan20-testing 2026-10-04: cell is 12 mm OD inner tube, 15 mm ID outer, 75 mm long (1.5 mm radial gap), water εr ≈ 78. C_geo = 2π·ε0·εr·L/ln(15/12) = 1.4585...