system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does egg go from liquid to solid when heated even though we learned in school that things go from liquid to gas when heated?
gpt
Egg whites aren't a pure substance, and they're undergoing a chemical change when heated. Normally, the proteins in eggs are all balled up and dissolved. When heated, they unfold and tangle around one another to form a gooey structure that can hold its shape.