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397 - Gas Balloon Pilot Exam BPL - With pressure and temperature given, any gas being heavier or lighter than air depends on what?

Question 397 - Principles of Flight (Balloon) - Exam BPL Gas - Balloon Pilot License

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

Training tests and timed exam simulations Exam BPL Gas - Balloon Pilot License