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Pastimes : NNBM - SI Branch -- Ignore unavailable to you. Want to Upgrade?

To: Clappy who wrote (32680)	3/17/2004 11:43:04 AM
From: Dalin	Read Replies (3) \| Respond to of 104197

HAPPY ST PATRICKS DAY!!! Don't forget your green. The market is! <g> :o) O mally rally

To: Clappy who wrote (32680)	3/17/2004 11:53:04 AM
From: lurqer	Read Replies (1) \| Respond to of 104197

Time to raise the scientific standards of the conversation on this thread. Sinking Guinness bubbles are down to science Gerard Seenan It will give reassurance on St Patrick's Day to a nation of stout drinkers that their eyes, despite the alcohol, are not deceiving them. After decades of public-house debate and more than a little scientific argument, researchers in Edinburgh and California say that it is counter-intuitive but true: the bubbles in freshly poured pints of Guinness really do float down. Andrew Alexander, from Edinburgh University, began his experiment in the pub a few years ago. That investigation proved inconclusive. So with his then boss, Dick Zare, of Stanford University, California, he transferred the experiment to the laboratory. Using a high-speed digital camera with a zoom lens, they tracked the movement of the elusive bubbles on film. They believed they would prove downward-floating bubbles were nothing more than an illusion, but found the opposite to be true. They say the nitrogen bubbles which touch the walls of the glass experience drag, which hinders them from floating up. Bubbles in the centre of the glass, though, can rise freely. This creates a circular flow causing the bubbles at the edge of the glass to be pushed downwards. guardian.co.uk lurqer