Questions & Answers about Air hangat ini bisa diminum setelah makan malam.
In Indonesian, air means water, not the gas we breathe. This is just a false friend between English and Indonesian. For air as in English, Indonesian uses udara. So air hangat literally means warm water.
Hangat usually means warm (pleasantly warm, not too hot).
Panas means hot (high temperature, can burn or be uncomfortable).
So air hangat is like warm water or lukewarm water, while air panas suggests very hot or boiling water.