system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do carbonated drinks feel almost like a burning sensation in our mouths if it's just the formation of bubbles of CO2 gas? Likewise, why does it hurt to burp that gas up through our nose?
gpt
the bubbles are made of carbon dioxide. When carbon dioxide contacts the lining of your throat, chemical reactions convert a portion of it into carbonic acid. The sudden change in pH from the acid activates the pain receptors in your throat, causing a burning sensation.