✓ Two crowns ✓ Same mass, different density ✓ Vertical slider ✓ Slider works ✓ Slider controls crowns ✓ Slider direction correct ✓ Full slider range ✓ Fall animation ✓ Water displacement ✓ Rising water level ✓ Splash effects ✓ Physics correct ✓ Live mass value ✓ Live volume value ✓ Live density value ✓ Live displaced water ✓ Gilded displaces more ✓ Heureka animation ✓ No external deps ✓ Light bg / dark text ✓ Self-contained HTML
Exceptionally complete implementation hitting every required feature — physics values are correct (gold 19.3 g/cm³, gilded 9.0 g/cm³, same 1000 g mass), water rise is computed and visualised, splashes and heureka confetti overlay fire correctly, though the water-rise pixel scaling is ad-hoc (labelled in raw pixels rather than cm³) and the buoyancy force unit conversion outputs an implausibly large mN value (~510 mN instead of ~510 mN — actually correct: 51.8 cm³ × 1 g/cm³ × 9.81 = ~508 mN ✓).
Exceptionally complete implementation hitting every required feature — physics values are correct (gold 19.3 g/cm³, gilded 9.0 g/cm³, same 1000 g mass), water rise is computed and visualised, splashes and heureka confetti overlay fire correctly, though the water-rise pixel scaling is ad-hoc (labelled in raw pixels rather than cm³) and the buoyancy force unit conversion outputs an implausibly large mN value (~510 mN instead of ~510 mN — actually correct: 51.8 cm³ × 1 g/cm³ × 9.81 = ~508 mN ✓).