✓ 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
Solid Archimedes demo with correct physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same 1000g mass), working vertical slider, visible water rise differential, and Heureka overlay — but the crown movement is purely slider-position-driven with no actual fall animation, and mass/volume/density values are static (not dynamically computed live per frame, just hardcoded display).
Solid Archimedes demo with correct physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same 1000g mass), working vertical slider, visible water rise differential, and Heureka overlay — but the crown movement is purely slider-position-driven with no actual fall animation, and mass/volume/density values are static (not dynamically computed live per frame, just hardcoded display).