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At what percentage is the air considered completely saturated with water vapor?

  1. 80%

  2. 100%

  3. 50%

  4. 70%

The correct answer is: 100%

Air is considered completely saturated with water vapor at 100% relative humidity. This means that the air has reached its maximum capacity to hold water vapor at a specific temperature. When air is at 100% relative humidity, it can no longer hold additional moisture, which may lead to the formation of precipitation, fog, or dew as the excess moisture condenses. Understanding this concept is crucial in fields such as meteorology and wildland firefighting, as saturated air can influence fire behavior and weather patterns. The other percentages indicated in the choices represent partial saturation levels where the air can still absorb more moisture. For instance, at 80%, 70%, or 50% relative humidity, the air has not reached saturation and can incorporate additional water vapor, thereby affecting atmospheric conditions and potential fire activity.