<?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">gas</topic></authority><related type="other"><topic>gas-lighting</topic></related><related type="other"><topic>gas cookstoves</topic></related><related type="broader"><topic>materials by physical state</topic></related><variant type="other"><topic>gases</topic></variant> <note xml:lang="en"><![CDATA[ Substance in the gaseous state, the state of matter distinguished from the liquid and solid states by very low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container. ]]></note></mads>