🧪 Molecular Kinetic Energy — 3D Gas Chamber

This 3D companion drives the exact same kinetic-theory mechanic as the 2D original inside a real WebGL cube: every sphere's speed is drawn from sqrt(T/100) × (rand()×2+1) in a random 3D direction, walls flip the crossed velocity component, and pairwise collisions swap the velocity component along the line of centers — the direct 3D generalization of the 2D version's rotate-swap-rotate elastic collision, now correct for a sphere hitting another sphere from any angle in space rather than just in a plane. Pressure is read the same way, too — the fraction of particles touching a wall this frame, scaled by temperature — and the same 200K/400K thresholds switch the phase readout between solid, liquid and gas. Orbit the chamber with the mouse while raising the temperature slider to watch the particle cloud go from a slow, ordered drift to a fast, chaotic sphere-storm bouncing visibly off all six faces of the box.