Gas in a Box

Where does pressure come from? Watch molecules bounce off the walls — the sum of those tiny impacts is exactly the pressure of an ideal gas.

Gas in a Box — Kinetic TheoryLive

ideal gas · pressure from collisions

Controls

Speed1×

Pressure emerges from molecules hammering the walls. More particles or higher temperature → higher pressure, exactly as PV = nRT predicts.

Presets

Particles (n)

Temperature

▶ Run in Python

Data Inspector

Particles120

Temperature3.0

Pressure (wall)0

LawPV = nRT

Governing equation

P V = N k_{B} T, N = 120, T = 3.0

Reading this result: Pressure scales with both particle count and temperature: doubling either roughly doubles the force on the walls (P ∝ nT).

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How it works

This kinetic-theory simulation models gas molecules as elastic particles bouncing in a box. Pressure is measured directly from wall impacts; raising the temperature or particle count raises it, demonstrating the ideal gas law PV = nRT from first principles.

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Frequently asked questions

Is this kinetic theory of gases tool really free?▾

Yes. Gas in a Box runs entirely in your browser using your device's own compute, so local use is free forever. You only pay Compute Tokens if you scale a job to the cloud.

Do I need to install anything?▾

No. Everything runs client-side in a modern browser — no downloads, no license, no account required to start.

Can I save or share my simulation?▾

Create a free account to save projects, and use a shareable embed or minted DOI to publish a live, interactive version anywhere.

How accurate are the results?▾

The solver uses established numerical methods, but results are for research and educational purposes and should be validated against experiment or professional review before you rely on them.