Physics of Beer (and other Liquids)

We want to take the theme "Zwischen Brötchen und Borussia" literally and deal with the physics of liquids from breakfast coffee to stadium beer. In particular, we will shed light on the physics surrounding beer foam. Why does beer foam form and what does it actually look like? This turns out to be a physically challenging problem that has been researched for centuries and is still being researched today. To do this, we also need to familiarise ourselves with the surface tension of liquids, which also causes interesting effects in and on liquids in many other places and is also responsible for the shape of soap bubbles, for example. The characteristic shape of coffee stains is also related to this, or the "tears" in a wine or schnapps glass.  

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