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SCIENCE NOTES - WEATHER LESSON 4 (Chapter 10) Where does water vapor come from? - The water in the air is water vapor. The amount of water vapor in the air is humidity. - What gets into the air by evaporation, the water turns from a liquid to a gas. - Condensation is when water vapor changes from a gas to a liquid. - Relative humidity is a comparison between how much water vapor is in the air and how much the air can hold. - Precipitation is when water falls down to Earth. What Happens When Warm Air Cools? - Air gets colder by reaching a higher altitude. - When cold air and warm air meets, the warm air gets pushed upward (which makes it cool).