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Ch. 1 Weather
Air Pressure
Term | Definition |
---|---|
density | the amount of mass in a given volume of air |
pressure | the force pushing on an area or surface |
Air pressure | the result of the weight of a column of air pushing down on an area |
barometer | an instrument that is used to measure air pressure |
mercury barometer | a glass tube open at the bottom end and partially filled with mercury |
aneroid barometer | an airtight metal chamber. when air pressure increases, the thin walls of the chamber are pushed in. |
`altitude | the distance above sea level |