Editing Potassium (section)

====Niche uses====
There are thousands of uses of various potassium compounds. One example is [[potassium superoxide]], {{chem2|KO2}}, an orange solid that acts as a portable source of oxygen and a carbon dioxide absorber. It is widely used in [[Rebreather#Rebreathers using an absorbent that releases oxygen|respiration systems]] in mines, submarines and spacecraft as it takes less volume than the gaseous oxygen.<ref>[[#Greenwood|Greenwood]], p. 74</ref><ref>{{cite book|url = https://archive.org/details/historyofunderwa00marx|url-access = registration|title = The history of underwater exploration|first = Robert F. |last = Marx|publisher =Courier Dover Publications| date = 1990|isbn = 978-0-486-26487-5|page=[https://archive.org/details/historyofunderwa00marx/page/93 93]}}</ref>
:{{chem2|4 KO2 + 2 CO2 → 2 K2CO3 + 3 O2}}

Another example is [[potassium cobaltinitrite]], {{chem2|K3[Co(NO2)6]}}, which is used as artist's pigment under the name of [[Aureolin]] or Cobalt Yellow.<ref name="Getts">{{cite book|publisher = Courier Dover Publications|url = https://books.google.com/books?id=bdQVgKWl3f4C&pg=PA109|title = Painting materials: A short encyclopaedia|isbn = 978-0-486-21597-6|author = Gettens, Rutherford John|author2 = Stout, George Leslie|date = 1966|pages = 109–110|access-date = 2016-01-08|archive-date = 2023-01-19|archive-url = https://web.archive.org/web/20230119031503/https://books.google.com/books?id=bdQVgKWl3f4C&pg=PA109|url-status = live}}</ref>

The stable isotopes of potassium can be [[Laser cooling|laser cooled]] and used to probe fundamental and [[Quantum technology|technological]] problems in [[Quantum mechanics|quantum physics]]. The two [[boson]]ic isotopes possess convenient [[Feshbach resonance]]s to enable studies requiring tunable interactions, while {{chem|40|K}} is one of only two stable [[fermion]]s amongst the alkali metals.<ref>{{cite journal|last1=Modugno|first1=G.|last2=Benkő|first2=C.|last3=Hannaford|first3=P.|last4=Roati|first4=G.|last5=Inguscio|first5=M.|date=1999-11-01|title=Sub-Doppler laser cooling of fermionic ${}^{40}\mathrm{K}$ atoms|journal=Physical Review A|volume=60|issue=5|pages=R3373–R3376|doi=10.1103/PhysRevA.60.R3373|arxiv=cond-mat/9908102|bibcode=1999PhRvA..60.3373M|s2cid=119001675}}</ref>