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495 - EASA Drone A2 License - Which air mass is physically lighter (less dense) at the same temperature and pressure?

Question 495 - Meteorology - EASA Drone License A2

Dry air
They have the exact same density
Humid air (because water vapour molecules weigh less than the nitrogen and oxygen molecules they replace)
Cold air

Training tests and timed exam simulations EASA Drone License A2