+**Vapor** is a substance in the [gas](/wiki/gas) state, but below its critical temperature, meaning it can return to a [liquid](/wiki/liquid) phase solely by an increase in pressure. It often forms through [evaporation](/wiki/evaporation) from a liquid or [sublimation](/wiki/sublimation) from a solid.
+## See also
+- [Condensation](/wiki/condensation)
+- [Steam](/wiki/steam)
+- [Atmosphere](/wiki/atmosphere)
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