Editing Microscopic scale (section)

=== Chemistry and physics ===
[[File:Arnager-kalk-bornholm 09 hg.jpg|thumb|Photomicrograph of Arnager Kalk ("Arnager Limestone"), taken with a Scanning Electron Microscope. From the Upper Cretaceous of Bornholm, Denmark: a microscopic view of prismatic crystals and spheroidal aggregates of unidentified authigenic minerals.<ref>{{Citation |last=Grobe/AWI |first=Hannes |title=SEM photomicrograph of Arnager Kalk ("Arnager Limestone") from the Upper Cretaceous of Bornholm, Denmark: close up of prismatic crystals and spheroidal aggregates of unidentified authigenic minerals. |date=1980-04-07 |url=https://commons.wikimedia.org/wiki/File:Arnager-kalk-bornholm_09_hg.jpg |access-date=2022-05-27}}</ref>]]
The [[entropy]] and disorder of the universe can be observed at a microscopic scale, with reference to the second and third [[Laws of thermodynamics|law of thermodynamics]]. In some cases, this can involve calculating the entropy change within a container of expanding gas molecules and relating it to the entropy change of its environment and the universe.<ref>{{Cite journal |last1=OpenStax |last2=Herrera-Siklody |first2=Paula |date=2016-08-03 |title=4.7 Entropy on a Microscopic Scale |url=https://pressbooks.online.ucf.edu/phy2048tjb/chapter/4-7-entropy-on-a-microscopic-scale/ |language=en}}</ref>