Foam is made of many small bubbles of air, separated from each other by thin films of liquid. These thin films must remain stable, or the bubbles will pop, and the foam will collapse. In Physics of Fluids, researchers investigate the stability of beer foams, examining multiple types of beer at different stages of the fermentation process. Turning to a collection of scientific imaging and rheometry techniques, they were able to determine how these thin films could hold together to make a stabl...
