system
Given the following post, respond as if you're commenting on Reddit:
human
Does stomach acid just sit in a pool at the bottom of your stomach? On the ISS, does it form a bubble?

I'm trying to digest the implications.
gpt
Yes, but 'just' is a little misleading because it's also at the top, the edges, and any other nook and cranny that your stomach might be folded up into. As soon as there's unfilled space above the gastric juices, what you actually have a stomach with gas that's ready to come out of you at the first opportunity. That's exactly what happens when you burp!

On the ISS it won't be pulled towards your feet any more, but your stomach will fold down accordion-style so that it snugly encompasses any gastric juices all the same, waiting for the next meal.

(N.B. Off-topic and onto science communication, but a true 'bubble' is technically a grouping of gas particles held together by pressure from a fluid that surrounds them. In that sense, were your stomach to have a lot of gas in it, the gastric juices would potentially be able to float in the centre in the form of a 'droplet'. There'd have to be an aaaawwwful lot of airspace to allow the gastric juice to ball up in the centre and float; more likely it'd just coat the inside of the stomach due to surface tension (maybe a physicist would have a more accurate name for the forces holding it in place), like the soup that's left clinging to the sides of a bowl after you've eaten the majority of it.)