system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does it smell worse when you fart in water?
gpt
There is also another explanation. When you fart in the air due to "diffusion" the fart and the "normal" air mix up, so that you smell less fart gas.

In water (usually in the bath tub, where you are in and your head close to the water surface) the fart gas moves up the water bubble without mixing with the air. When it comes up to the surface, directly close to your nose, the smell is more "pure" and therefore worse.