Fusion plasma
Fusion plasma is a state of matter where atomic nuclei and electrons are separated and nuclei can undergo nuclear fusion.
How big is it?
100,000,000 K
Temperature · defined reference
A little perspective
Fusion plasma is 99,000,000 K warmer than Neutron star surface.
Neutron star surface: Neutron star surface temperature is the intense heat found at the outer layer of a young neutron star after a supernova.
Measurements, assumptions & sources +
Fusion plasma
A 100 million K plasma example. High temperature alone does not specify total thermal energy.
Defined examples — our methodology
The marked temperature is calibrated. Unmeasured illustration details are representative.
Neutron star surface
A representative one-million-kelvin thermal surface scale for a young neutron star. Surface temperature falls as the remnant cools and depends on age, magnetic field, atmosphere and observing model.
NASA Imagine the Universe — Neutron stars
The marked representative young surface temperature is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 100,000,000 K
For comparison, this page uses temperature. This is labelled defined reference: an explicit comparison model rather than a claim that every example has the same value.
A 100 million K plasma example. High temperature alone does not specify total thermal energy.
The identifying illustration and the numerical comparison remain separate. How calibrated comparisons work →
Recorded properties
Fusion plasma dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 100,000,000 K | Not recorded | defined reference |
Around this scale
Go smaller. Go bigger.
These links use compatible temperature records, ordered around the selected value.
Nearest lower value · TemperatureNeutron star surface1,000,000 KNeutron star surface temperature is the intense heat found at the outer layer of a young neutron star after a supernova.
Nearest higher value · Fundamental physicsPlanck temperature1.417 × 10³² KThe Planck temperature is a theoretical temperature scale at which quantum gravitational effects are expected to become important.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
More ways to see it
Curated comparisons
There’s always another scale
Follow your curiosity.
TemperatureAbsolute zero0 KAbsolute zero is the lowest temperature permitted by thermodynamics, where a system has the least thermal energy available to it.TemperatureRoom temperature20 °CRoom temperature describes indoor air conditions generally considered comfortable for people and suitable for ordinary activities.
SpaceSun1,391,000 kmThe Sun is the star at the centre of the Solar System.Fundamental physicsPlanck temperature1.417 × 10³² KThe Planck temperature is a theoretical temperature scale at which quantum gravitational effects are expected to become important.TemperatureNeutron star surface1,000,000 KNeutron star surface temperature is the intense heat found at the outer layer of a young neutron star after a supernova.TemperatureSpace Shuttle re-entry plasma8,000 KSpace Shuttle re-entry plasma is the extremely hot, ionised gas layer that forms around a spacecraft as it re-enters Earth's atmosphere at high speed.TemperatureMolten iron1,811 KMolten iron is iron in its liquid state, formed by heating solid iron above its melting point.TemperatureLava1,373 KLava is molten rock that erupts from a volcano and flows on the Earth's surface before cooling and solidifying.