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Telegraph: Bubbles in Guinness ‘go down not up’ say scientists
Guinness, in the best Irish tradition, does things differently. The bubbles in a freshly poured pint appear to be cascading down the side of the glass – yet the creamy top which is the drink’s trademark remains.
Members of the Royal Society of Chemistry set out to investigate the puzzle over the course of one lunchtime.
Scientists used a super-fast camera that could zoom in and magnify the bubbles 10 times.
The study showed that the more visible outlying bubbles in a pint of Guinness did move downwards, as a result of circulation flow and drag.
At the centre of the glass, the bubbles were free to rise rapidly, pulling the surrounding liquid with them and setting up a circulating current.
Flowing outwards from the surface, the frothy ”head”, the current hit the glass edge and was pushed down. Bubbles held back by dragging on the side of the glass were caught in the circulation and forced to go with the flow – the wrong way, for a bubble.
(Follow the link for the full article)
I have only one thing to say: Cascade!
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