The bubbles in Guinness sink to the bottom rather than float to the top like all other beers. Why?

Son of The Household Cavalry

This is due to the way Guinness is dispensed and specifically the tap and gas mixture. A guinness tap is a special piece of equipment unlike standard bar taps. Also, the frothy nectar is dispensed with a CO2/Nitrogen mix at a very high pressure so that the bubble size is extremely small, leading to the lovely dense Guinness head and the infamous wave effect as seen in a properly pulled pint. Just so I do not get talked about by Brainy Blonde I will add the source http://www.fourfold.org/RoverWeb/lro/Year-1997/970110.html Apr 14 02, 7:18 PM

Barrow boy

Sometime during 2001, I read a synopsis of a paper in which somebody researched why bubbles fall to the bottom in a glass of Guinness. As I remember it, there is a circulation in the glass so that what you see is the bubbles sinking on the outside, but what you don't see is the bubbles rising up again in the centre to form the head. It seems to be similar to the circulation of air in a storm cell. Apr 15 02, 10:01 AM