Question 688Navigation General

The correct answer is A) air becomes saturated with water vapor. The dew point is the temperature at which the air becomes saturated with water vapor, meaning the air can no longer hold any more water. At this point, water vapor begins to condense into liquid water droplets, forming dew, fog, or clouds. This is the definition of the dew point, and it is reached when the air is 100% saturated with water vapor. The other options are incorrect because they do not accurately describe the conditions at which the dew point is reached. The temperature of the air equaling the seawater temperature (B), the atmospheric pressure being 14.7 lbs per square inch (C), and the relative humidity reaching 50% (D) are not the specific criteria for determining the dew point.