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science/chpt 15key-2
chapeter 15 key terms - 2
Question | Answer |
---|---|
denisty | amount of mass in a given volume of air |
pressure | the force pushing on an area or surface |
air pressure | result of the weight of a column of air pushing down on an area |
barometer | instrument that is used to measure air pressure |
mercury barometer | a barometer that consisting of a glass tube partially filled with mercury - with its open en resting in a dish of mercury |
aneroid barometer | a barometer that measures air pressure without using a liquid |
altitude | Elevation above sea level |
Because air has mass, it has other properties | including density and pressure |
Two common kinds of barometers | Mercury and aneroid |
As air pressure decreases | as altitude increases - so does density |