- 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.
Origin of troposphere
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for troposphere
Here, well above the troposphere, the air was thin and always clear.Islands of Space
John W Campbell
At last Ken leveled off in the troposphere, at an altitude of five miles.Fly By Night
Arthur Dekker Savage
In distinction from the stratosphere, the part of the atmosphere lying below it is called the troposphere.Meteorology
Charles Fitzhugh Talman
Below this level is the troposphere, the turbulent zone of clouds, rain, and fog.
Investigators have noted the importance of rain or snow in washing fallout particles from the air in the troposphere.
- 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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for troposphere
Online Etymology Dictionary, © 2010 Douglas Harper
- 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 exosphere mesosphere stratosphere thermosphere. See illustration at atmosphere.
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