Ideal Gas Chamber (Nature abhors a vacuum)

This interactive simulation visualizes a gas confined to a chamber, modeled as non-interacting particles making perfectly elastic collisions. Opening a valve (by clicking the gear and dragging) allows particles to flow into a second chamber, where despite fully deterministic motion, the system naturally evolves toward an even distribution. 

As the simulation runs, the percentage of particles in each chamber is displayed at the top right and top left, revealing how simple classical mechanics gives rise to statistical behavior, fluctuations, and the familiar tendency toward equilibrium. A quiet, visual demonstration of why nature appears to abhor a vacuum.

Controls: 

• Left / right arrow keys to increase / decrease the number of particles
• Up / down arrow keys to increase / decrease individual particle speed
• Reset bottom on top right to restart simulation with new parameters
• Click and drag gear to open valve between chambers

A demonstration can be found on my YouTube channel: