Atmosphere
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The atmosphere is the mass of air surrounding a planet.[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.
References
- ↑ Wile, Dr. Jay L. Exploring Creation With Physical Science. Apologia Educational Ministries, Inc. 1999, 2000
