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troposphere
[ trop-uh-sfeer, troh-puh- ]
noun
- the lowest layer of the atmosphere, 6 miles (10 km) high in some areas and as much as 12 miles (20 km) high in others, within which there is a steady drop in temperature with increasing altitude and within which nearly all cloud formations occur and weather conditions manifest themselves.
troposphere
/ ˌtrɒpəˈsfɛrɪk; ˈtrɒpəˌsfɪə /
noun
- the lowest atmospheric layer, about 18 kilometres (11 miles) thick at the equator to about 6 km (4 miles) at the Poles, in which air temperature decreases normally with height at about 6.5°C per km
troposphere
/ trō′pə-sfîr′,trŏp′ə- /
- The lowest and densest region of the Earth's atmosphere, extending from the Earth's surface to the tropopause. The troposphere is characterized by temperatures that decrease with increasing altitude. At the top of this region, temperatures are close to −55°C (−67°F). The weather, major wind systems, and cloud formations occur mostly in the troposphere.
- See also exosphereSee illustration at atmosphere
troposphere
- The lowest layer of the atmosphere of the Earth , extending from ground level to an altitude of seven to ten miles.
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Derived Forms
- tropospheric, adjective
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Other Words From
- trop·o·spher·ic [trop-, uh, -, sfer, -ik, -, sfeer, -, troh-p, uh, -], adjective
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Word History and Origins
Origin of troposphere1
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Example Sentences
Here, well above the troposphere, the air was thin and always clear.
Investigators have noted the importance of rain or snow in washing fallout particles from the air in the troposphere.
The dense reaches of the troposphere—the weather belt where storms are born—dropped below them.
At last Ken leveled off in the troposphere, at an altitude of five miles.
In distinction from the stratosphere, the part of the atmosphere lying below it is called the troposphere.
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