Editing Carbon dioxide (section)

=== Minor uses ===
[[File:Carbon Dioxide Laser At The Laser Effects Test Facility.jpg|thumb|right|upright=1.35|A [[carbon-dioxide laser]]]]
Carbon dioxide is the [[active laser medium|lasing medium]] in a [[carbon-dioxide laser]], which is one of the earliest type of lasers.

Carbon dioxide can be used as a means of controlling the [[pH]] of swimming pools,<ref>{{Cite book |url=https://books.google.com/books?id=IWpWAAAAMAAJ&q=%C2%A0%C2%A0Carbon+dioxide+can+be+used+as+a+means+of+controlling+the+pH+of+swimming+pool |title=TCE, the Chemical Engineer |date=1990 |publisher=Institution of Chemical Engineers |access-date=2 June 2020 |archive-date=17 August 2021 |archive-url=https://web.archive.org/web/20210817030754/https://books.google.com/books?id=IWpWAAAAMAAJ&q=%C2%A0%C2%A0Carbon+dioxide+can+be+used+as+a+means+of+controlling+the+pH+of+swimming+pool |url-status=live}}</ref> by continuously adding gas to the water, thus keeping the pH from rising. Among the advantages of this is the avoidance of handling (more hazardous) acids. Similarly, it is also used in the maintaining [[Reef aquarium|reef aquaria]], where it is commonly used in [[calcium reactor]]s to temporarily lower the pH of water being passed over [[calcium carbonate]] in order to allow the calcium carbonate to dissolve into the water more freely, where it is used by some [[coral]]s to build their skeleton.

Used as the primary coolant in the British [[advanced gas-cooled reactor]] for nuclear power generation.

Carbon dioxide induction is commonly used for the euthanasia of laboratory research animals. Methods to administer {{CO2}} include placing animals directly into a closed, prefilled chamber containing {{CO2}}, or exposure to a gradually increasing concentration of {{CO2}}. The [[American Veterinary Medical Association]]'s 2020 guidelines for carbon dioxide induction state that a displacement rate of 30–70% of the chamber or cage volume per minute is optimal for the humane euthanasia of small rodents.<ref name=avma>{{cite web |url=https://www.avma.org/kb/policies/documents/euthanasia.pdf |title=AVMA guidelines for the euthanasia of animals: 2020 Edition |date=2020 |publisher=[[American Veterinary Medical Association]] |access-date=August 13, 2021 |archive-date=1 February 2014 |archive-url=https://web.archive.org/web/20140201174132/https://www.avma.org/KB/Policies/Documents/euthanasia.pdf |url-status=live}}</ref>{{Rp|5, 31}} Percentages of {{CO2}} vary for different species, based on identified optimal percentages to minimize distress.<ref name=avma />{{Rp|22}}

Carbon dioxide is also used in several related [[carbon dioxide cleaning|cleaning and surface-preparation]] techniques.