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Atmosphere
‘Atmosphere’ refers to the layer of gases surrounding a planet; each planet has its own atmosphere.
International standards and resources
The International Union of Pure and Applied Chemistry (IUPAC), Chemistry and the Environment Division, Commission on Atmospheric Chemistry, has published a Glossary of atmospheric chemistry terms. (Note that use of initial capitals for terms in this glossary reflects the style of the publication; most terms do not require initial capitals.)
Earth’s 5 principal atmospheric layers are (with distance from Earth’s surface):
- troposphere (<12 km)
- stratosphere (12–50 km)
- mesosphere (50–80 km)
- thermosphere (80–700 km)
- exosphere (>700 km).
These 5 layers are delineated according to temperature; other layers may be named for other properties, such as ozone layer, ionosphere and magnetosphere. Use lower case for atmospheric layers in any context.
Related terms also take lower case:
biosphere middle atmosphere
Use lower case for terms related to atmospheric chemistry unless they include a proper noun:
acid rain air pollution index haze horizon
See also: