system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How an Iron lung works?
gpt
An iron lung creates an air-tight seal around your body. It will change the pressure of the air inside from negative to positive, and back again. When a person's muscles will not allow them to breathe on their own, this pressure change will force your muscles to move in the way necessary to make you inhale and exhale.