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385 - Hot Air Balloon Exam Prep - With pressure and temperature given, any gas being heavier or lighter than air depends on what?

Question 385 - Principles of Flight (Balloon) - BPL Hot Air - Balloon Pilot License

On the mean kinetic energy of the molecules
On the molecule mass of the gas
On the content of water vapour in the gas
On the number of gas molecules

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