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81 - Hot Air Balloon Exam Prep - Why should a liquid gas bottle only be filled to 80% of its volume?

Question 81 - Aircraft General Knowledge - BPL Hot Air - Balloon Pilot License

Because temperature would get too high
Because it would get too heavy otherwise
To provide space for temperature-induced expansion
To provide space for expansion in case of external cooling

Training tests and timed exam simulations BPL Hot Air - Balloon Pilot License