<?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">physics concepts</topic></authority><related type="narrower"><topic>[energy and related concepts]</topic></related><related type="narrower"><topic>pressure</topic></related><related type="narrower"><topic>acoustics concepts</topic></related><related type="narrower"><topic>mechanics concepts</topic></related><related type="narrower"><topic>time</topic></related><related type="narrower"><topic>optical concepts</topic></related><related type="other"><topic>physics</topic></related><related type="broader"><topic>physical sciences concepts</topic></related><variant type="other"><topic>concepts, physics</topic></variant><variant type="other"><topic>physics concept</topic></variant> <note xml:lang="en"><![CDATA[ Collocates descriptors for concepts related to the nature and properties of non-living matter and energy. ]]></note></mads>