Editing Triple point (section)

== Table of triple points ==
This table lists the gas–liquid–solid triple points of several substances. Unless otherwise noted, the data come from the U.S. [[National Bureau of Standards]] (now [[NIST]], National Institute of Standards and Technology).<ref>{{cite book |first1=Yunus A. |last1=Cengel |first2=Robert H. |last2=Turner |title=Fundamentals of thermal-fluid sciences |location=Boston |publisher=McGraw-Hill |year=2004 |page=78 |isbn=0-07-297675-6 }}</ref>

{| class="wikitable sortable" style="text-align:center"
!width="170"|Substance !!width="160" data-sort-type=number| ''T'' &#91;[[Kelvin|K]]&#93; ([[Celsius|°C]]) !!width="230" data-sort-type=number| ''p'' &#91;[[Pascal (unit)|kPa]]&#93;*  ([[Atmosphere (unit)|atm]])
|-
|align="left"| [[Acetylene]]
| {{convert|192.4|K|C|sortable=on}}  || {{convert|120|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Ammonia]]
| {{convert|195.40|K|C|sortable=on}} || {{convert|6.060|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Argon]]
| {{convert|83.8058|K|C|sortable=on}}  || {{convert|68.9|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Arsenic]]
| {{convert|1090|K|C|sortable=on}} || {{convert|3628|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Butane]]<ref>See [[Butane (data page)]]</ref>
| {{convert|134.6|K|C|sortable=on}}  || {{convert|7e-4|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| Carbon ([[graphite]])
| {{convert|4765|K|C|sortable=on}} || {{convert|10132|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Carbon dioxide]]
| {{convert|216.55|K|C|sortable=on}} || {{convert|517|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Carbon monoxide]]
| {{convert|68.10|K|C|sortable=on}} || {{convert|15.37|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Chloroform]]<ref>See [[Chloroform (data page)]]</ref><ref>{{cite web |title=Trichloromethane |url=https://webbook.nist.gov/cgi/cbook.cgi?ID=C67663&Mask=4#Thermo-Phase |website=NIST Chemistry WebBook, SRD 69 |publisher=NIST (National Institute of Science and Technology) |access-date=11 May 2024}}</ref>
| {{convert|209.61|K|C|sortable=on}} || ?
|-
|align="left"| [[Deuterium]]
| {{convert|18.63|K|C|sortable=on}} || {{convert|17.1|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Ethane]]
| {{convert|89.89|K|C|sortable=on}} || {{convert|1.1e-3|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Ethanol]]<ref>See [[Ethanol (data page)]]</ref>
| {{convert|150|K|C|sortable=on}} || {{convert|4.3e-7|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Ethylene]]
| {{convert|104.0|K|C|sortable=on}} || {{convert|0.12|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Formic acid]]<ref>See [[Formic acid (data page)]]</ref>
| {{convert|281.40|K|C|sortable=on}} || {{convert|2.2|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Helium-4]] (vapor−He-I−He-II)<ref name=Donnelly>{{cite journal| title=The Observed Properties of Liquid Helium at the Saturated Vapor Pressure | first1=Russell J.| last1=Donnelly| first2=Carlo F.| last2=Barenghi| journal=[[Journal of Physical and Chemical Reference Data]]| year=1998| volume=27| issue=6| pages=1217–1274| doi=10.1063/1.556028|bibcode = 1998JPCRD..27.1217D }}</ref>
| {{convert|2.1768|K|C|sortable=on}} || {{convert|5.048|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Helium-4]] ([[Hexagonal close-packed|hcp]]−[[Body-centered cubic|bcc]]−He-II)<ref name=Hoffer>{{cite journal| title=Thermodynamic properties of <sup>4</sup>He. II. The bcc phase and the P-T and VT phase diagrams below 2 K | first1=J. K.| last1=Hoffer| first2=W. R.| last2=Gardner| first3=C. G.| last3=Waterfield| first4=N. E.| last4=Phillips| journal=[[Journal of Low Temperature Physics]]| date=April 1976| volume=23| issue=1| pages=63–102| doi=10.1007/BF00117245|bibcode = 1976JLTP...23...63H | s2cid=120473493}}</ref>
| {{convert|1.463|K|C|sortable=on}} || {{convert|26.036|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Helium-4]] (bcc−He-I−He-II)<ref name=Hoffer/>
| {{convert|1.762|K|C|sortable=on}} || {{convert|29.725|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Helium-4]] (hcp−bcc−He-I)<ref name=Hoffer/>
| {{convert|1.772|K|C|sortable=on}} || {{convert|30.016|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Hexafluoroethane]]<ref>See [[Hexafluoroethane (data page)]]</ref>
| {{convert|173.08|K|C|sortable=on}} || {{convert|26.60|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Hydrogen]]
| {{convert|13.8033|K|C|sortable=on}} || {{convert|7.04|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Hydrogen-1]] (Protium)<ref>{{cite web | url=https://www.britannica.com/science/protium-isotope | title=Protium &#124; isotope &#124; Britannica | date=27 January 2024 }}</ref>
| {{convert|13.96|K|C|sortable=on}} || {{convert|7.18|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Hydrogen chloride]]
| {{convert|158.96|K|C|sortable=on}} || {{convert|13.9|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Iodine]]<ref>{{cite book |last=Walas |first=S. M. |title=Chemical Process Equipment – Selection and Design |location=Amsterdam |publisher=Elsevier |year=1990 |page=639 |isbn=0-7506-7510-1 }}</ref>
| {{convert|386.65|K|C|sortable=on}} || {{convert|12.07|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Isobutane]]<ref>See [[Isobutane (data page)]]</ref>
| {{convert|113.55|K|C|sortable=on}} || {{convert|1.9481e-5|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Krypton]]
| {{convert|115.76|K|C|sortable=on}}  || {{convert|74.12|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Mercury (element)|Mercury]]
| {{convert|234.3156|K|C|sortable=on}} || {{convert|1.65e-7|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Methane]]
| {{convert|90.68|K|C|sortable=on}} || {{convert|11.7|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Neon]]
| {{convert|24.5561|K|C|sortable=on}} || {{convert|43.332|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Nitric oxide]]
| {{convert|109.50|K|C|sortable=on}} || {{convert|21.92|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Nitrogen]]
|{{convert|63.18|K|C|sortable=on}} || {{convert|12.6|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Nitrous oxide]]
| {{convert|182.34|K|C|sortable=on}} || {{convert|87.85|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Oxygen]]
| {{convert|54.3584|K|C|sortable=on}} || {{convert|0.14625|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Palladium]]
| {{convert|1825|K|C|sortable=on}} || {{convert|3.5e-3|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Platinum]]
| {{convert|2045|K|C|sortable=on}} || {{convert|2e-4|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Radon]]
| {{convert|202|K|C|sortable=on}} || {{convert|70|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Silane|(mono)Silane]]<ref>{{cite web |url=https://encyclopedia.airliquide.com/silane |title=Silane-Gas Encyclopedia |author=<!--Not stated--> |website=Gas Encyclopedia |publisher=Air Liquide <!-- |access-date={{date}} automatically using date of last page refresh makes no sense for a citation --> }}</ref>
| {{convert|88.48|K|C|sortable=on}} || {{convert|0.019644|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Sulfur dioxide]]
| {{convert|197.69|K|C|sortable=on}} || {{convert|1.67|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Titanium]]
| {{convert|1941|K|C|sortable=on}} || {{convert|5.3e-3|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Uranium hexafluoride]]
| {{convert|337.17|K|C|sortable=on}} || {{convert|151.7|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Water]]<ref name=Wagner/><ref name=Murphy/>
| {{convert|273.16|K|C|sortable=on}} || {{convert|0.611657|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Xenon]]
| {{convert|161.3|K|C|sortable=on}} || {{convert|81.5|kPa|atm|abbr=on|sortable=on}}
|-
|align="left"| [[Zinc]]
| {{convert|692.65|K|C|sortable=on}} || {{convert|0.065|kPa|atm|abbr=on|sortable=on}}
|}

Notes:
* For comparison, typical atmospheric pressure is 101.325 kPa (1 atm).
* Before the new definition of SI units, water's triple point, 273.16 K, was an exact number.