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Sigma KEE - Atmosphere

atmosphere

Atmosphere is a Mixture of gases surrounding any celestial object that has a gravitational field strong enough to prevent the gases from escaping.

Relationships
Parents	(ExtensionFn Fluid)
	region	A topographic location. Regions encompass surfaces of Objects, imaginary places, and GeographicAreas. Note that a Region is the only kind of Object which can be located at itself. Note too that Region is not a subclass of SelfConnectedObject, because some Regions, e.g. archipelagos, have parts which are not connected with one another.
Instances	earths atmosphere	EarthsAtmosphere is the layer of gases, a mixture of mainly oxygen and nitrogen, surrounding PlanetEarth. See also Air.