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Relative humidity is defined as what?

  1. The amount of moisture in the air

  2. The percentage of water vapor in the air compared to its capacity

  3. The total amount of rainfall over a period

  4. The measure of air pressure at sea level

The correct answer is: The percentage of water vapor in the air compared to its capacity

Relative humidity is defined as the percentage of water vapor present in the air compared to the maximum amount of moisture that air can hold at a given temperature. This concept is crucial because warmer air can hold more water vapor than cooler air, so the relative humidity changes with temperature. For instance, when air is at 100% relative humidity, it is fully saturated with moisture, which can lead to cloud formation and precipitation if it cools. Understanding relative humidity is essential for drone pilots, as it affects flight conditions and the performance of the drone, including battery life and stability.