system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: The saying goes “never add water to acid”. How come your stomach acid does not react when you drink water?
gpt
You don't want to add water to acid because some strong acids can react violently to the water, heating it quickly and causing it to boil, splashing acid out of the container. In the stomach there is both no danger of the acid splashing out, and also the acid employed in the stomach simply isn't that strong so there is no danger of that level of reaction.