A paper in the arXiv, discussed on the Physics arXiv Blog, investigates what the blog post called “one of the more intriguing conundrums in fluid dynamics”: why bubbles in Guinness appear to sink as the drink settles and the head forms.
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John Wood & Paul Harrison “One more kilometre”
[vimeo url=http://vimeo.com/37796909]
Look at the fluid dynamics!