# Critical point

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**Critical point** may refer to:

- [Critical phenomena](/source/Critical_phenomena) in physics
- [Critical point (mathematics)](/source/Critical_point_(mathematics)), in calculus, a point where a function's derivative is either zero or nonexistent
- [Critical point (set theory)](/source/Critical_point_(set_theory)), an elementary embedding of a transitive class into another transitive class which is the smallest ordinal which is not mapped to itself
- [Critical point (thermodynamics)](/source/Critical_point_(thermodynamics)), a temperature and pressure of a material beyond which there is no longer any difference between the liquid and gas phases
- [Quantum critical point](/source/Quantum_critical_point)
- [Critical point (network science)](/source/Critical_point_(network_science))
- [Construction point](/source/Construction_point), in skiing, a line that represents the steepest point on a hill

## See also

- [Critical value (disambiguation)](/source/Critical_value_(disambiguation))
- [Critical path (disambiguation)](/source/Critical_path_(disambiguation))
- [Brillouin zone](/source/Brillouin_zone)
- [Percolation thresholds](/source/Percolation_thresholds)

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Adapted from the Wikipedia article [Critical point](https://en.wikipedia.org/wiki/Critical_point) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Critical_point?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.