system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why doesn't fire from gas powered devices (grills, lighters, etc.) spread to their fuel containers?
gpt
Fire is a reaction with oxygen.  Inside the container, there is little to no oxygen and the gas itself takes up the space.  If you shot a propane can and it ignited, it wouldn't explode it would just have a flaming jet coming out the side as the gas only ignites once it leaves the container and meets oxygen.