What is the reason for a puddle of water below the helicopter after a flight in summer?

Question

Question PPL(H) - Private Pilot License - Aircraft General Knowledge

QuizVDS · Accepted Answer

The air conditioning was used in flight

QuizVDS · Answer

The windshield wiper fluid has leaked

QuizVDS · Answer

The helicopter was frozen at cruising altitude

QuizVDS · Answer

Vapour bubbles from the fuel lines are condensed.

Id 149 - PPL(H) EN - What is the reason for a puddle of water below the helicopter after a flight in summer?