Editing Soap bubble (section)

=== Wetting ===

When a soap bubble is in contact with a solid or a liquid surface [[wetting]] is observed. On a solid surface, the [[contact angle]] of the bubble depends on the [[surface energy]] of the solid.<ref>{{Cite journal | doi=10.1016/j.jcis.2009.05.062| pmid=19541324| title=Contact angle of a hemispherical bubble: An analytical approach| journal=Journal of Colloid and Interface Science| volume=338| issue=1| pages=193–200| year=2009| last1=Teixeira| first1=M.A.C.| last2=Teixeira| first2=P.I.C.| bibcode=2009JCIS..338..193T| s2cid=205804300| url=http://centaur.reading.ac.uk/29242/1/contact_rev3.pdf}}</ref><ref>{{Cite journal |doi = 10.1063/1.4812710|title = Wetting of soap bubbles on hydrophilic, hydrophobic, and superhydrophobic surfaces|journal = Applied Physics Letters|volume = 102|issue = 25|pages = 254103|year = 2013|last1 = Arscott|first1 = Steve|bibcode = 2013ApPhL.102y4103A|arxiv = 1303.6414|s2cid = 118645574}}</ref> A soap bubble has a larger contact angle on a solid surface displaying [[ultrahydrophobicity]] than on a hydrophilic surface – see [[Wetting]]. On a liquid surface, the contact angle of the soap bubble depends on its size - smaller bubbles have lower contact angles.<ref>M.A.C. Teixeira, S. Arscott, S.J. Cox and P.I.C. Teixeira, Langmuir 31, 13708 (2015).[http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.5b03970]</ref><ref>{{cite web |url=https://ciencias.ulisboa.pt/pt/noticia/08-02-2016/o-despertar-da-bolha |title=O despertar da bolha |access-date=2016-02-09 |url-status=live |archive-url=https://web.archive.org/web/20160212130252/http://ciencias.ulisboa.pt/pt/noticia/08-02-2016/o-despertar-da-bolha |archive-date=2016-02-12 }}</ref>

<gallery mode=packed heights=180>
File:Bubble on an ultrahydrophobic surface.jpg|A soap bubble wetting an ultrahydrophobic surface
File:Bubble on a liquid surface.jpg|A soap bubble wetting a liquid surface
</gallery>