Fog forms when air is cooled to a point where it can no longer hold all of its water vapor. What is this temperature called?

Why: The Remote Pilot Study Guide states that the dew point "is the temperature at which the air can hold no more moisture. When the temperature of the air is reduced to the dew point, the air is completely saturated and moisture begins to condense out of the air in the form of fog, dew, frost, clouds, rain, or snow."

• Confuses the dew point with density altitude, a separate concept describing air density's effect on aircraft performance, not the saturation temperature that produces fog.
• Confuses the dew point with standard temperature, the fixed ISA reference temperature for a given altitude (used on the Density Altitude Chart), which has no direct relationship to moisture saturation.