WASHINGTON, D.C., September 13, 2016 -- Clinking your glass of beer often leaves its contents sloshing back and forth. Soon, though, the motion stops, your drink settles down, and you can take a sip without getting foam on your nose. It turns out that the foam helps stop the sloshing. Now, physicists have figured out why.
The analysis, published this week in Physics of Fluids, from AIP Publishing, reveals a surprising effect on the surface of the water that contradicts conventional thought and deepens our understanding of the role of capillary forces.