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Unit: Water and the Atmosphere Lesson 2: Air Pressure Essential Questions: 1.) What are some properties of air? 2.) What instruments measure air pressure? 3.) How does altitude affect air pressure and density? Mass Density Air pressure- the result of the weight of the air column pushing on you A barometer is an instrument that measures air pressure The two types are: 1.) Mercury barometer 2.) Aneroid barometer Altitude is the distance above sea level As altitude increases: Pressure decreases Density decreases