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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>
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>
The term ''atmosphere'' is also a unit of [[pressure]]. An atmosphere is defined as the amount of pressure exerted by a column of air at sea level. This is equal to approximately 14.7 pounds per square inch.
==References==
==References==