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'''Pressure''' is defined as the [[force]] per unit [[area]] exerted on a surface.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref>
 
'''Pressure''' is defined as the [[force]] per unit [[area]] exerted on a surface.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref>
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English units used for air pressure include:
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Imperial units used for air pressure include:
 
*[[atmosphere]]s
 
*[[atmosphere]]s
 
*pounds per square inch (PSI)
 
*pounds per square inch (PSI)
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