Research & Reports

How The Foam On Your Beer Keeps It From Spilling

A new study explains how your beer’s foamy top helps it from spilling, by clinging to the glass.

How The Foam On Your Beer Keeps It From Spilling

Ever wondered why you need razor sharp concentration when holding a cup of coffee or tea so it doesn’t spill over but you can walk across a crowded bar without spilling any of your beer on your hands?

Researchers from the Massachusetts Institute of Technology and École Polytechnique Fédérale de Lausanne in Switzerland wondered too and gave us an answer.

 

Beer Foam: Why It Stops Our Beer From Spilling

It all comes down to foam and capillary forces. Capillary action is the force that describes how droplets can form and how the surface of a liquid adheres to the side of a container.

When it comes to your beer, the foam clings to the sides of the cup and it doesn’t allow the beer to travel as far up the glass as a normal foam-free drink would. It’s the surface tension of the many tiny bubbles at the top of your beer that cling to the glass and provide a shield to movements.

The foam doesn’t have to be thick — even foam only five bubbles thick will have a measurable effect. But the thicker the foam the better at preventing spillage. Brews like Guinness would often be the least spillable beer at the bar.

 

Original story from American Institute of Physics.

 

Interested in learning more about beer? Check out JB University to up your knowledge on beer styles, the science behind brewing beer, and so much more:

Beer Styles 201: All About Imperial / Double India Pale Ales
All About Dark German Beer Styles: Doppelbocks, Dark Lagers, and Schwarzbiers
How to Brew Glow in the Dark Beer — A DIY Home Brewing Kit

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