system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can food or drink of temperatures that are clearly sufficient to scald my lips seem to elicit no pain response whatsoever once within the mouth?
gpt
When you sip a hot drink, two important things happen; 

1. You draw air quickly over the surface of the hot liquid, cooling it more quickly than if the air against the surface were still, and

2. You separate out a much smaller volume of hot liquid than if you were to simply pour it into your mouth like a glass of water. This means that as you spread a small volume of hot liquid over a large area of your mouth, only a small bit of heat gets transferred to any portion of your mouth, ideally not enough to burn you.