Sheppard Air Certified Flight Instructor (CFI) 2025 – 400 Free Practice Questions to Pass the Exam

The ratio of the existing water vapor in the air compared to the maximum amount that could exist at a given temperature is defined as relative humidity. This measurement expresses how much moisture the air contains in relation to the maximum moisture it can hold at a specific temperature, usually given as a percentage.

As temperature increases, the capacity of air to hold moisture also increases, which is why the absolute amount of moisture does not remain constant; it varies based on temperature. Therefore, knowing the relative humidity helps in understanding how saturated the air currently is, which is significant in weather predictions, understanding comfort levels, and predicting phenomena like fog or precipitation.

In contrast, the dew point is the temperature at which air becomes saturated and water vapor begins to condense into liquid, saturation point refers to the state of the air when it has reached its maximum capacity for holding moisture, and absolute humidity measures the actual amount of water vapor present in the air without considering the air's capacity based on temperature. Understanding these concepts helps in grasping the dynamics of atmospheric moisture and its effects on weather conditions.