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33 - FAA Part 107 Drone Exam Prep - Humidity affects density altitude because:

Question 33 - Loading and performance - FAA Part 107 Drone Exam Prep

Water vapor is lighter than dry air, making moist air less dense and thereby increasing the density altitude.
Water vapor is heavier than dry air, making moist air more dense and thereby decreasing density altitude.
Humidity physically coats the propellers with water, adding weight.

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