Editing Liquid oxygen (section)

==History==
*By 1845, [[Michael Faraday]] had managed to liquefy most gases then known to exist. Six gases, however, resisted every attempt at liquefaction<ref>[http://www.scienceclarified.com/Co-Di/Cryogenics.html Cryogenics]. Scienceclarified.com. Retrieved on 2012-07-22.</ref> and were known at the time as "[[permanent gas]]es". They were oxygen, [[hydrogen]], [[nitrogen]], [[carbon monoxide]], [[methane]], and [[nitric oxide]].
*In 1877, [[Louis Paul Cailletet]] in France and [[Raoul Pictet]] in Switzerland succeeded in producing the first droplets of liquid air.<ref>{{cite book |last1=Papanelopoulou |first1=Faidra |title=Louis Paul Cailletet, the Liquefaction of Oxygen and the Emergence of an `In-Between Discipline': Low-Temperature Research |date=2015 |publisher=Springer International Publishing |isbn=978-3-319-14553-2 |pages=9-22 |url=https://doi.org/10.1007/978-3-319-14553-2_2}}</ref>
*In 1883, Polish professors [[Zygmunt Wróblewski]] and [[Karol Olszewski]] produced the first measurable quantity of liquid oxygen.<ref>{{Citation
| last    =Kubbinga
| first   =Henk
| year     =2010
| title    = A Tribute to Wróblewski and Olszewski
| journal =Europhysics News
| volume  =41
| issue   =4
| pages =21-24
| doi =10.1051/epn/2010402
| url =https://www.europhysicsnews.org/10.1051/epn/2010402/pdf
| archive-url  =
| archive-date =
}}</ref>