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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.
Answers. Relevance. Rating Newest Oldest. Best Answer: Yes, air does expand when it is heated because of the fact that the molecules in the air start vibrating and moving around more faster and the distance between the molecules increases so as a result the air expands.nswers. Relevance. Rating Newest Oldest. Best Answer: Yes, air does expand when it is heated because of the fact that the molecules in the air start vibrating and moving around more faster and the distance between the molecules increases so as a result the air expands.