system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If sound travels fastest through solids and slowest through gases, why does heat do the opposite?

Aren't they both just the vibration of molecules?
gpt
Heat transfer in a gas is primarily through the movement of the gas.  As the gas gets stirred up the hot gas can move across its container very quickly.

A hot solid can transfer heat very quickly in the same way.  Heat a bucket of ball bearings up.  Then through the bucket of bearings across the room.  All the heat just moved across the room in a second.