Hard discs move in straight lines and collide elastically. Every disc starts at the same speed.
Tap to heat a region and watch the curve re-form at the new temperature. The same ?seed= always gives the same run.
LITElastic hard-disc dynamics. Total kinetic energy must stay constant to 1 part in 106, or the page throws. The gold curve is f(v) = (v/kT)·e−v²/2kT.