Why do bubbles in Guinness sink?

Why do bubbles in Guinness sink?

Benilov, E. S., Cummins, C. P., Lee, W. T.
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Volume:
81
Year:
2013
Language:
english
Journal:
American Journal of Physics
DOI:
10.1119/1.4769377
File:
PDF, 1.01 MB
english, 2013
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