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Air becomes completely saturated and moisture starts to condense when it reaches the temperature of the dew point. The dew point is the specific temperature at which air becomes saturated with moisture and can no longer hold additional water vapor. As the air temperature drops to this point, the air's capacity to hold moisture diminishes, leading to condensation, which can manifest as dew, fog, or clouds.

When the air temperature increases rapidly, it does not directly correlate with saturation but rather can increase the capacity of air to hold moisture. Humidity at 50% indicates that the air is only partially saturated with moisture and is not sufficient for condensation to occur. Additionally, while decreasing atmospheric pressure can influence weather patterns and air temperature, it does not directly determine when moisture will condense in the air. Understanding the relationship between temperature and dew point is essential for predicting weather changes and recognizing atmospheric conditions conducive to cloud formation and precipitation.