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398 - EASA BPL Gas Balloon Theory in English - How does a gas react when released from a pressurized container?

Question 398 - Principles of Flight (Balloon) - BPL Gas Balloon Pilot Licence

The gas heats adiabatically due to expansion
The gas cools adiabatically due to expansion
The gas condenses inside the envelope
The gas cools due to thermal contact with environmental air

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