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AhaBulb: Stuff Everyone Should Know · ahabulb.com/drone-high-density-altitude-conditions

Which set of conditions creates a high density altitude?

Hot, humid air at a high elevation makes the air thin and hurts performance.

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  1. Hot, humid air at a high elevation ✔
  2. Cold, dry air at a low elevation
  3. Cool air with high barometric pressure

Why: Density altitude goes up when the air gets thinner. Heat, humidity, high elevation and low pressure all thin the air, so props and wings have less air to work with.

Huh, didn't know that: Water vapor is lighter than air, so moist air is lighter than dry air.

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Did you hear about the restaurant on the moon? Great food, but no atmosphere.
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References

Answer: Hot, humid air at a high elevation. Density altitude goes up when the air gets thinner. Heat, humidity, high elevation and low pressure all thin the air, so props and wings have less air to work with.

  1. FAA Remote Pilot Study Guide (FAA-G-8082-22), Ch. 3b www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/remote_pilot_study_guide.pdf
    The conditions that result in a high density altitude are high elevations, low atmospheric pressures, high temperatures, high humidity
    Checked 2026-10-07.

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