Scientists have shown that the bubbles in a pint of Guinness To mark St Patrick’s Day, a team of Scottish and US researchers has An earlier study concluded that the phenomenon may only have been an Bubbles in the centre of the glass, however, are free to rise. A circular The effect occurs in any liquid, say the scientists, but the contrast The Scottish scientists worked in collaboration with colleagues led by from Ananova<\/a><\/p>\n<\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Scientists have shown that the bubbles in a pint of Guinness really do move down instead of up. To mark St Patrick’s Day, a team of Scottish and US researchers has produced video evidence to show the bubbles being dragged … Continue reading
\n really do move down instead of up. <\/font><\/strong><\/p>\n![](\"http:\/\/cyber.law.harvard.edu\/blogs\/static\/dowbrigade\/guinn.jpg\")
<\/p>\n
\n produced video evidence to show the bubbles being dragged to the bottom
\n of the glass.<\/p>\n
\n optical illusion.
\n Close examination reveals that as the pint settles, bubbles touching
\n the walls of the glass experience drag that prevents them floating up.<\/p>\n
\n flow is created, causing bubbles at the the edge to be pushed downwards
\n on the inside surface of the glass. <\/p>\n
\n between the dark stout and its creamy bubbles makes it easier to spot
\n in Guinness.<\/p>\n
\n Professor Dick Zare at the University of Stanford in California.<\/p>\n