Why Bubbles Fall in Guinness
After hours of complicated math, they determined that it depends on the shape of the glass. When poured down the center of a cylindrical glass all the bubbles will rise together. But when poured down the center of a regular shaker pint glass or the ubiquitous Guinness tulip glass, the bubbles in the center rise to the top, causing a pressure imbalance which pulls the bubbles on the sides of the glass down to the bottom of glass and into the column of rising bubbles.
I think that's how it works. Maybe you could get a clearer explanation here or here.
Labels: Beer Science
posted by Jeff Holt at 09:00