Chemical Equilibrium — Le Chatelier's Principle (2D)

This 2D simulator visualizes the classic N₂O₄ ⇌ 2NO₂ gas-phase equilibrium inside a sealed, resizable vessel. Pale N₂O₄ molecules and brown NO₂ molecules bounce around the container, continually swapping between forms to show that equilibrium is dynamic, not static. Heat or cool the system, compress or expand the vessel walls, or inject extra NO₂ to apply a stress, and watch the population of each species — and the container's overall color — shift according to Le Chatelier's principle while the live equilibrium constant K_c and concentration ratio update in real time.