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Module #3 (Yr 2)
Physical Science Mod #3
Term | Definition |
---|---|
Atmosphere | The mass of air surrounding a planet. |
Atmospheric Pressure | The pressure exerted by the atmosphere on all objects within it |
Barometer | An instrument used to measure atmospheric pressure. |
Homosphere | The lower layer of earth's atmosphere, which exists from ground level to roughly 80 kilometers (50 mi) above sea level. |
Heterosphere | The upper layer of earth's atmosphere, which exists higher than roughly 80 km (50 mi) above sea level. |
Troposphere | The region of the atmosphere that extends from ground level to roughly 11 km (7 mi) above sea level. |
Stratosphere | The region of the atmosphere that spans altitudes of roughly 11 km (7 mi) to 48 km (30 mi) above sea level. |
Mesophere | The region of the atmosphere that spans altitudes of roughly 48 km (30 mi) to 80 km (50 mi) above sea level. |
Jet Streams | Narrow bands of high-speed winds that circle the earth, blowing from west to east. |
Heat | Energy that is transferred as a consequence of temperature differences. |
Temperature | A measure of the energy of random motion in a substance's molecules. |
Thermosphere | The region of the atmosphere between altitudes of roughly 80 km (50 mi) and 460 km (285 mi). |
Exosphere | The region of the atmosphere above an altitude of roughly 460 km (285 mi). |
Ionosphere | The region of the atmosphere between the altitudes of roughly 65 km (40 mi) and 330 km (205 mi), where the gases are ionized. |
ATM | Atmosphere unit used to measure atmospheric pressure; relative to sea level pressure. |