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AIR PRESSURE,[object Object],Chapter 2, Section 2,[object Object]
Properties of Air,[object Object],Because air has mass, it also has density and pressure.,[object Object]
Density is the amount of mass of a substance in a given volume.,[object Object]
2.  Pressure is the force pushing on an area of surface.,[object Object]
Air pressure can be measured with a barometer.,[object Object]
There are two types of barometers used.,[object Object]
A mercury barometer consists of a glass tube open at the bottom end and partially filled with mercury.,[object Object]
An aneroid barometer uses an airtight metal chamber.,[object Object]
Units of Pressure,[object Object],Most weather reports for the public use inches of mercury.,[object Object]
The National Weather Service maps measure air pressure in millibars.,[object Object]
Altitude,[object Object],Air pressure decreases as altitude increases.,[object Object]
As air pressure decreases, so does density.,[object Object]

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