✓ 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
Slider direction is inverted (top=submerged, bottom=air) and the water-rise formula divides by 150×150=22500 cm² making the displacement effect nearly invisible; mass/volume/density values are static, not live.
Slider direction is inverted (top=submerged, bottom=air) and the water-rise formula divides by 150×150=22500 cm² making the displacement effect nearly invisible; mass/volume/density values are static, not live.