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395 - EASA BPL Hot-Air Balloon Theory in English - Which of the following statements is correct?

Question 395 - Principles of Flight (Balloon) - BPL Hot-Air Balloon Pilot Licence

The density of hull air is lower with decreasing environmental pressure
The density of hull air is higher with increasing environmental pressure
The density of hull air is lower than environmental air only if the hull temperature is lower than environmental temperature
The density of hull air is lower than environmental air only if the hull temperature is higher than environmental temperature

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