system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why doesn't tin foil get hot?

I just took a baking sheet with tin foil out of a 450 degree oven.  Why after 20 minutes in there can I touch the tin foil?
gpt
Foil gets very hot.  It just also has the following properties:

* There's not much mass to it because it's so thin, so it can only hold a small about of heat.

* Being a metal, it conducts heat very well.

* It has *massive* surface area compared to volume.

Those three combined means that it stores very little energy, and can conduct it away almost instantly via its large surface area and high ability to conduct heat.

The surface area thing is the biggest contributer.  Try crumpling a bunch of foil into a very tight ball and leaving that in the oven.  Later, if you *very carefully* touch it, you will see that it's very hot.