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Air pressure
| Term | Definition |
|---|---|
| Density | The amount of mass of a substance i a given volume; mass per unit volume |
| Pressure | The force exerted on a surface divided by the total area over which the force is exerted. |
| Air Pressure | Th pressure caused by weight of a column of air pushing down on an area |
| Barometer | An instrument used to measure changes in air pressure |
| Mercury Barometer | An instrument changes in air pressure, consisting of a glass tube partially filled with mercury, with its open end resting in a dish of mercury. |
| Aneroid Barometer | an instrument the measures changes in air pressure without using a liquid |
| Altitude | Elevation above sea level |