A new experiment by chemists from Stanford University and the University of Edinburgh has finally proven what beer lovers have long suspected: When beer is poured into a glass, the bubbles sometimes go down instead of up.
"Bubbles are lighter than beer, so theyre supposed to rise upward," said Richard N. Zare, the Marguerite Blake Wilbur Professor in Natural Sciences at Stanford. But countless drinkers have claimed that the bubbles actually go down the side of the glass. Could they be right, or would that defy the laws of physics?
This frothy question reached a head in 1999 after Australian researchers announced that they had created a computer model showing that it was theoretically possible for beer bubbles to flow downward. The Australians based their simulation on the motion of bubbles in a glass of Guinness draught - a popular Irish brew that contains both nitrogen and carbon dioxide gas.
Mark Shwartz | EurekAlert!
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