Eli5: why does beer foam up when poured too quickly?

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Anonymous 0 Comments

The foam is made up of small bubbles.
The faster you pour the more gas escapes the liquid, rises to the top and forms those bubbles

The amount and the stability of those bubbles depends on the the liquid used.
Clean drinking water, probably no bubbles.
River water sometimes foams a little when conditions are right.
Soapy water? That gets sold as a kids toy because they make such big bubbles.

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