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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.
The water in the pipe is cooler than the air in the room. This cools the outside of the pipe which in turn causes the moisture in the air to condense on the pipe. what smartarse said, except he forgot to mention that the air in the room has to contain water vapor.