Well, I've asked so I might as well answer it.

Those tiny bubbles usually are not "air leaking into the beer" from outside. They mainly come from dissolved carbon dioxide (CO2) already inside the beer. During fermentation, yeast produces CO2, and breweries also often add extra CO2 under pressure. While the beer stays sealed, that gas remains dissolved in the liquid.

When the beer is poured into a glass, the pressure drops, so the CO2 wants to escape. Tiny imperfections in the glass, like microscopic scratches, dust particles, fibers, or rough spots at the bottom, act as "nucleation sites." Gas molecules gather there first, forming visible bubbles. The bubbles then grow, detach, and rise.

So the bubbles are mostly coming out of the beer itself, not from trapped atmospheric air in the glass. In some cases, a tiny amount of gas may begin from microscopic pockets already stuck in the rough surface, but the continuing stream is fed by dissolved CO2 leaving the beer.

>>16986047
>mostly coming out of the beer itself
annoying thing about ai is that it just can't bring itself to commit to anything, even to the obviously correct explanation it's giving. it always needs to leave this way out: "mostly" from the beer, see, other, alternative possibilities are there too

>>16986089
I wonder what kind of psychosis OP has to make a thread like this presumably in reddit first and then here and then gets blown out in both places.

They also put some features in some glass to make them fizz up and bubble a little more. Kinda like those spots on car windscreens.