Critical Temperature

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Critical Temperature

1. The temperature above which a substance cannot exist in the liquid state, regardless of the pressure.
2. As applied to reactor overheat or afterheat, the temperature at which the least resistant component of the reactor core begins to melt down.
3. As applied to materials, the temperature at which a change in phase takes place causing an appreciable change in the properties of the material.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use