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Glossary of Apologia Physical Science, Module 3

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Atmospheric pressure
The pressure exerted by the atmosphere on all objects within it
Barometer
An instrument used to measure atmospheric pressure
Heat
Energy that is being transferred
Heterosphere
The upper layer of earth's atmosphere, which exists higher that 50 miles above sea level
Homosphere
The lower layer of earth's atmosphere, which exists from ground level to roughly 50 miles above sea level
Jet stream
A narrow band of high-speed winds that circle the earth, blowing from west to east
Temperature
A measure of the energy of motion in a substance's molecules
Atmosphere
The mass of air surrounding a planet.
Troposphere
The region of the atmosphere that extends from ground level to roughly 7 miles above sea level.
Stratosphere
The region of the atmosphere that spans altitudes of 7 miles to 30 miles.
Mesosphere
The region of the atmosphere that spans altitudes of 30 miles to 50 miles.
Thermosphere
The region of the atmosphere between altitudes of 50 miles (80 kilometers) and 460 kilometers.
Exosphere
The region of the atmosphere above an altitude of 460 kilometers.
Ionosphere
The region of the atmosphere between the altitudes of 65 kilometers and 330 kilometers where the gases are ionized.

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