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Line 1: − + + + − − − Atmosphere is also used by Chemists and Physicists as a unit of pressure. Example: one atmosphere of pressure is the pressure exerted on objects by the atmospheric gasses, air (principally 21%oxygen and 79% nitrogen), at sea level of approximately 14.7 pounds per inch square.
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The mass of air surrounding a planet.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
The '''atmosphere''' is the mass of air surrounding a [[planet]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
Atmosphere is also used by [[Chemistry|Chemists]] and [[Physics|Physicists]] as a unit of [[pressure]]. Example: one atmosphere of pressure is the pressure exerted on objects by the atmospheric [[gas]]ses, [[air]] (principally 21% [[oxygen]] and 79% [[nitrogen]]), at sea level of approximately 14.7 pounds per inch square.
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