— 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
Implements a general Archimedes principle simulator with correct physics (F_A = ρ·V·g, floating fraction = ρ_body/ρ_fluid) but has no crowns, no vertical drop slider, no rising water level, no splash effects, and no Heureka animation — it is fundamentally the wrong demo for the prompt.
Implements a general Archimedes principle simulator with correct physics (F_A = ρ·V·g, floating fraction = ρ_body/ρ_fluid) but has no crowns, no vertical drop slider, no rising water level, no splash effects, and no Heureka animation — it is fundamentally the wrong demo for the prompt.