Editing Acetylene (section)

===Changes of state===
At atmospheric pressure, acetylene cannot exist as a liquid and does not have a melting point. The [[triple point]] on the [[phase diagram]] corresponds to the melting point (−80.8&nbsp;°C) at the minimal pressure at which liquid acetylene can exist (1.27 atm). At temperatures below the triple point, solid acetylene can change directly to the [[vapour]] (gas) by [[Sublimation (phase transition)|sublimation]]. The sublimation point at atmospheric pressure is −84.0&nbsp;°C.<ref>Handbook of Chemistry and Physics (60th ed., CRC Press 1979–80), p. C-303 in Table ''Physical Constants of Organic Compounds'' (listed as ''ethyne'').</ref>