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Making the world better, one answer at a time. Thin air is caused by low oxygen pressure at high altitudes. The lack of oxygen makes the air less dense. Thin air is caused by low oxygen pressure at high altitudes. The lack of oxygen makes the air less dense.
Answer 5: Air has water vapor in it, and the amount of water vapor that is stable in the air depends on temperature. Cool it off to where there is too much water vapor, and the vapor will condense out to form droplets, either on a cold surface, or just in the air (that's what clouds are).his is why we have humidity. A cold cup can take thermal energy out of the water vapor in the air next to the cup, causing the water vapor to condense into liquid water. The same kind of phenomena occurs when you take ice cream out of the freezer-you see frost on the outside of the container.