Editing Silicon dioxide (section)

===Molten SiO<sub>2</sub>===
[[Molten silica]] exhibits several peculiar physical characteristics that are similar to those observed in liquid [[water (properties)|water]]: negative temperature expansion, density maximum at temperatures ~5000&nbsp;°C, and a heat capacity minimum.<ref>{{cite journal|vauthors=Shell SM, Debenedetti PG, Panagiotopoulos AZ|year=2002|title=Molecular structural order and anomalies in liquid silica|url=http://www.engr.ucsb.edu/~shell/papers/2002_PRE_silica.pdf|journal=[[Physical Review E|Phys. Rev. E]]|volume=66|issue=1|pages=011202|arxiv=cond-mat/0203383|bibcode=2002PhRvE..66a1202S|doi=10.1103/PhysRevE.66.011202|pmid=12241346|s2cid=6109212|access-date=2009-07-07|archive-date=2016-06-04|archive-url=https://web.archive.org/web/20160604062440/http://www.engr.ucsb.edu/~shell/papers/2002_PRE_silica.pdf|url-status=dead}}</ref> Its density decreases from 2.08&nbsp;g/cm<sup>3</sup> at 1950&nbsp;°C to 2.03&nbsp;g/cm<sup>3</sup> at 2200&nbsp;°C.<ref>{{cite journal|vauthors=Aksay IA, Pask JA, Davis RF|year=1979|title=Densities of SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Melts|url=http://www.princeton.edu/~cml/assets/pdf/7962aksay.pdf |archive-url=https://ghostarchive.org/archive/20221010/http://www.princeton.edu/~cml/assets/pdf/7962aksay.pdf |archive-date=2022-10-10 |url-status=live|journal=[[Journal of the American Ceramic Society|J. Am. Ceram. Soc.]]|volume=62|issue=7–8|pages=332–336|doi=10.1111/j.1151-2916.1979.tb19071.x}}</ref>