Today we will explain why the air in the cabins of airliners is so dry. It is all to do with a thing called "relative humidity." If you live in the tropics or have ever visited on vacation, you will know all about humidity and how uncomfortable it can be when there is too much water vapor. For this reason, many people decide to live at a higher elevation than sea level. As the altitude increases, the humidity decreases, making it more comfortable.
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