system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do my cheerios make a "crackling" sound in my milk?

Is this, like, the milk being absorbed or what?
gpt
When you pour milk into your bowl, the cereal absorbs the milk. As milk flows into the crispy kernel, the liquid puts pressure on the air inside and pushes it around.

The air shoves against each pocket’s walls until they shatter, forcing out a snap, or a crackle, or, as you, know, sometimes a pop.