Maths cracks beer froth mystery
Mathematicians have come up with a formula that predicts how the head on a pint of beer will change after pouring.
"What happens in beer, is the small bubbles shrink, the big bubbles grow," Professor Srolovitz told BBC News.
"Eventually, the big bubbles pop - although they pop for slightly different reasons. On Earth, there's gravity and the liquid that's within the walls tends to drain out back into the beer. The walls get thinner and thinner and eventually they pop."
Their advance could shed light on why the foam on a pint of lager quickly disappears, but the froth on a pint of Guinness sticks around.
The research could not only provide tips for better brewing, but could also have applications in metallurgy, say the authors.
Image: Neocorsten / Flickr
Tags: Beer | Beer Froth | Maths