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{{further|Timeline of low-temperature technology}}
[[File:Air Products Headquarters, Trexlertown.JPG|thumb|The global headquarters of [[Air Products]] in [[Trexlertown, Pennsylvania]], a leading global supplier of liquid hydrogen]]
[[File:Liquid_hydrogen_bubblechamber.jpg|thumb|Liquid hydrogen bubbles forming in two glass flasks at the [[Bevatron]] laboratory in 1955]]▼
[[File:Hydrogen Tank - GPN-2000-001458.jpg|thumb|A large hydrogen tank in a vacuum chamber at Lewis Research Center in 1967]]▼
[[Image:Linde-Wasserstofftank.JPG|thumb|Tank for liquid hydrogen of [[Linde AG|Linde]], [[Museum Autovision]], [[Altlußheim]],
In 1885, [[Zygmunt Florenty Wróblewski]] published hydrogen's critical temperature as {{convert|33|K|C F}}; critical pressure, {{convert|13.3|atm|psi}}; and boiling point, {{convert|23|K|C F}}.
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The [[triple point]] of hydrogen is at 13.81 K<ref name="IPTS-1968"/> 7.042 kPa.<ref>Cengel, Yunus A. and Turner, Robert H. (2004). ''Fundamentals of thermal-fluid sciences'', McGraw-Hill, p. 78, {{ISBN|0-07-297675-6}}</ref>
▲File:Liquid_hydrogen_bubblechamber.jpg|Liquid hydrogen bubbles forming in two glass flasks at the [[Bevatron]] laboratory in 1955
▲File:Hydrogen Tank - GPN-2000-001458.jpg|A large hydrogen tank in a vacuum chamber at Lewis Research Center in 1967
▲Image:Linde-Wasserstofftank.JPG|Tank for liquid hydrogen of [[Linde AG|Linde]], [[Museum Autovision]], [[Altlußheim]], [[Germany]]
==Safety==
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