system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: We use water to create cement mix. What stops cement from turning to mush again when it gets wet?
gpt
There's a chemical reaction taking place. It's the same reason the paint on your walls doesn't get wet again if you get water on it, and the same reason you can't turn bread back into dough just by adding water and mushing it up.