Interstellar Medium Phase Simulator

ISM phase

Selected phase

Temperature

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Density

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Thermal pressure P/k

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Pick a phase to see its typical temperature and particle density. All four float side by side in the scene at once.

Pressure balance across phases

Temperaturelog scale

Densitylog scale

P/k = n·Tlinear

MCCNMWNMHIM

Temperature and density swing by up to six orders of magnitude between phases, yet thermal pressure P = n·k·T stays roughly constant — the four phases float in approximate pressure equilibrium.

Molecular cloud — ~10-20 K, dense Cold neutral medium — ~100 K Warm neutral/ionized — ~8,000 K Hot ionized medium — ~10⁶ K, supernova-heated

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