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381 - EASA BPL Hot-Air Balloon Theory in English - What statement is correct with regard to the density of a gas?

Question 381 - Principles of Flight (Balloon) - BPL Hot-Air Balloon Pilot Licence

The density increases with increasing temperature and constant volume
The density decreases with decreasing volume and constant temperature
The density decreases with increasing temperature and constant volume
The density decreases with increasing temperature and constant pressure

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