Hi.. I'm a pilot and I'm trying to get a better grasp on meteorology. I'm wondering how exactly water vapor is contained in air. I understand it's mostly governed by the temperature of the air but does the temperature of the water affect that? Why is it dependent on the temperature of the air? When air is 100% saturated, what quantity (%) of 'normal' air is present? When no condensation nuclei are present, when will cloud form? Detailed explanations are appreciated!