Editing Iceberg (section)

=== Bubbles ===
Air trapped in snow forms bubbles as the snow is compressed to form firn and then glacial ice.<ref name=":3">{{Cite journal |last1=Scholander |first1=P. F. |last2=Nutt |first2=D. C. |date=1960 |title=Bubble Pressure in Greenland Icebergs |journal=Journal of Glaciology |language=en |volume=3 |issue=28 |pages=671–678 |doi=10.3189/S0022143000017950 |issn=0022-1430 |doi-access=free}}</ref> Icebergs can contain up to 10% air bubbles by volume.<ref name=":3" />{{not in source|reason=The article only reports gas pressures in the bubbles up to 20 atm, without volume estimations, but saying that "At high pressures the bubbles are compressed so the difference in density between glacier ice and bubble-free ice becomes only a small fraction of 1 per cent". Since air even at 20 atm is ≳30 times lighter than pure ice, this by no means can be interpreted as "10% air bubbles by volume".|date=August 2022}} These bubbles are released during melting, producing a fizzing sound that some may call "Bergie [[Carbonated water|Seltzer]]". This sound results when the water-ice interface reaches compressed air bubbles trapped in the ice. As each bubble bursts it makes a "popping" sound<ref name="cgfoi" /> and the acoustic properties of these bubbles can be used to study iceberg melt.<ref>{{Cite journal |last1=Glowacki |first1=Oskar |last2=Deane |first2=Grant B. |last3=Moskalik |first3=Mateusz |date=2018-05-16 |title=The Intensity, Directionality, and Statistics of Underwater Noise From Melting Icebergs |journal=Geophysical Research Letters |language=en |volume=45 |issue=9 |pages=4105–4113 |doi=10.1029/2018GL077632 |bibcode=2018GeoRL..45.4105G |s2cid=135352794 |issn=0094-8276|doi-access=free }}</ref>