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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.
Air tends to cool and condense as it rises, and to become warm and dry as it sinks. A Parcel of Air is an imaginary mass of air that doesn't exchange properties with surrounding air masses. In reality air masses do exchange properties, but this often occurs very slowly, especially if the air masses are large.n this situation, an air parcel will be warmer and less dense than the surrounding air and will rise due to buoyant forces. Clouds with extensive vertical development are indicative of absolute instability. Conditional instability is a state of instability that depends upon whether or not the rising air is saturated.