system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can you stick your entire hand into an open flame[camp fire, lighter] for a few seconds with minimal damage, but touching a hot metal [stove] burns instantly?
gpt
Air is a poor thermal conductor, but a great insulator.  In other words, air is greedy.  Once gets heat it wants to hold onto it and doesn’t like giving it away.

Metal on the other hand is a great thermal conductor. But a poor insulator.  Metal likes to share heat with anything that wants some, like your hand.  

Metal gets a gold star in kindergarten for sharing its heat, while air gets a time out for hogging the heat for itself.