Why does water change the pitch of a singing wineglass the way it does?

YIH-YUH CHEN2019-12-272019-12-272005https://scholars.lib.ntu.edu.tw/handle/123456789/443152Why does water change the pitch of a singing wineglass the way it does?journal article10.1119/1.20630352-s2.0-27744497678https://www.scopus.com/inward/record.uri?eid=2-s2.0-27744497678&doi=10.1119%2f1.2063035&partnerID=40&md5=1c4f53e4007cea4d4d2add647d0e6ae9