What is indicated by a relative humidity of 65 percent?

A relative humidity of 65 percent indicates that the air is holding 65% of its maximum capacity for moisture. Relative humidity is a measure of how much moisture the air is currently holding compared to the total amount it could hold at a specific temperature. Therefore, at 65% relative humidity, the air is not fully saturated; it still has the capacity to hold more moisture. This means that if conditions were to change, such as cooling the air, it could reach saturation, leading to condensation or precipitation. Understanding this concept is crucial, especially for flight operations, as humidity affects air density and overall atmospheric conditions. The measurement does not imply saturation, dryness, or suggest specific moisture addition capacities beyond what is indicated above.