Home▸Physics & Mechanics▸The Pauli Exclusion Principle: Why Matter Takes Up Space

🧊 The Pauli Exclusion Principle: Why Matter Takes Up Space

Explore why no two identical electrons, protons, or neutrons can ever occupy the same quantum state, and how this single rule builds atomic shells, shapes the periodic table, and props up dead stars against gravity.

Physics & Mechanics3DModerate60 FPS

This simulator visualizes how identical fermions fill up available quantum states one at a time while bosons can pile freely into the lowest state, and how that same exclusion mechanism generates a real, measurable degeneracy pressure as particles are compressed.

🔬 What It Demonstrates

🎮 How to Use

Toggle between fermion and boson particle types to watch how they fill energy levels differently, then increase the compression or particle count to see degeneracy pressure build up and resist further squeezing.

💡 Did You Know?

The electron degeneracy pressure holding up a white dwarf is so purely quantum mechanical that it would still exist even if the star were cooled to absolute zero, with no thermal motion left at all.

⚙ Under the hood

quantum mechanicspauli exclusion principlefermionsbosonselectron shellsperiodic tablewhite dwarfsneutron stars

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install