system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do hot things like car engines and tabletop electric burners make ticking and clicking noises after you turn them off and they’re cooling down?
gpt
When most materials heat up, they expand.  What you are hearing is the metal "shifting and popping" as it contracts once it starts cooling down again.

I work in a storage facility constructed of metal and can hear the building doing the same thing once the sun comes up and it is heating up.  It disturbs some of the customers because it can be quite loud sometimes.