<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">nitrous oxide</topic></authority><related type="broader"><topic>nitrogen oxides</topic></related><variant type="other"><topic>gas, laughing</topic></variant><variant type="other"><topic>laughing gas</topic></variant><variant type="other"><topic>oxide, nitrous</topic></variant> <note xml:lang="en"><![CDATA[ A colorless, sweet-smelling, sweet-tasting, non-flammable, slightly water-soluble gas, N2O. It is used chiefly as an anesthetic in dentistry and surgery, and in the manufacture of chemicals, such as aerosols. ]]></note></mads>