Belching is the release of gas from the digestive system through the mouth. Every time a person swallows food or liquid, a small amount of air goes into the stomach. This air forms gas bubbles in the stomach. The muscles in the food pipe relax to allow these bubbles to escape as burps. In space, the gas bubbles cannot rise to the top as there is no gravity to separate liquid from gas in their stomachs.
Can you burp in space?
