As far as I understood:
뜨겁다 - hot (food)
덥다 - hot (temperature)
Yes, but the first one is for any object, not just food, and the second is for weather temperature only (and saunas, so I've heard...in the sauna).
How is an apple hot?
In a pie or other freshly baked desert
How do a dog and cat converse in Korean?
apple be looking like a snack
The are so many patern instead of "ㅂ습니다" and "워요" for 뜨거. Can anyone explain whats the diff???