Forget the myths: Here’s how much foam a beer should actually have

The question of how much foam should top your beer has long been debated in bars around the world—but is there a definitive answer?

According to the Homebrewing Association, foam plays an important role in the beer-drinking experience. It’s more than just visual appeal. “The foam releases volatile aroma compounds, which enhance the flavor perception of the beer,” explains a homebrewing expert in the association’s blog.

Foam also helps maintain temperature and carbonation by forming a protective layer that slows the release of molecules. This means your beer stays colder and fizzier for longer, improving the overall taste.

So, how much foam should be in your glass?

That depends on the type of beer and how it’s poured. Beers from cans or bottles tend to be more carbonated and are typically poured to leave about 1 to 2 inches of foam at the top. The German American Social Club of Miami offers similar guidance, recommending that foam should not exceed 1.5 inches. The club warns that, depending on the type of beer and its carbonation content, the pouring technique might need to be altered to ensure that the right amount of foam ends up in the glass.

However, PRO Engineering also notes that the pour and type of beer aren’t the only factors affecting foam content and quality. Using clean glassware is essential to prevent interactions between the foam and any contaminants, which can cause it to break down more quickly. Ever wondered why beer glasses are often rinsed before being filled? That’s your answer.

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