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mLine 1:
Line 1: − The force per unit area exerted on a surface.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref>+ + − + − + − − − The term ''atmosphere'' has sometimes been 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 square inch.
bold, move atmosphere stuff to atmosphere
'''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>
English units used for air pressure include:
English units used for air pressure include:
*[[atmosphere]]s
*pounds per square inch (PSI)
*pounds per square inch (PSI)
*inches of mercury
*inches of mercury, which is the number of inches the given pressure will raise a column of [[mercury]]
==See also==
==See also==
*[[blood pressure]] - typically measured in millimeters of mercury
*[[blood pressure]] - measured in millimeters of mercury
==References==
==References==
<references/>
<references/>
[[category:physics]]
[[category:physics]]