system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why is it when you pour beer at the correct angle there is little to no foam?
gpt
Aeration.   Basically when you pour beer directly into the bottom of a glass it splatters around and gets agitated, mixing it with air and releasing CO2.  When you pour it gently down the side of a tilted glass you are keeping this to a minimum.