Changes

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.

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 [[pound]]s per square [[inch]].

==References==

==References==