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1. One of the four components of the Earth's ecosystem (the other three are biosphere, hydrosphere, and lithosphere), it is a band of gases enveloping the Earth's surface. Ninety-nine percent of its mass is concentrated within 20 miles of the earth's surface, and its two largest constituents (in the lowest part) are nitrogen (about 78 percent) and oxygen (about 21 percent). The remaining one percent includes mostly argon and minute amounts of carbon dioxide, helium, krypton, methane, neon, sulfur dioxide, water vapor, and xenon. In meteorology, atmosphere is divided into seven layers called regions (from the lowest to the highest): troposphere, stratosphere, mesosphere, chemosphere, thermosphere, ionosphere, and exosphere.

Use 'atmosphere' in a Sentence

Currently, there is a great deal of fear about the state of the Earth's atmosphere because of the massive amounts of noxious fumes and gases being released daily by human activity.
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My friends and I decided to go to the club for my birthday; we could sense an atmosphere of happiness from everyone who was there.
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After spending time with his new coworkers, Jeff decided that the atmosphere at the office was not a good fit for him.
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