Pressure 01 : General. (n.) Well Testing. The force distributed over a surface, usually measured in pounds force per square inch, or lbf/ in. 2, or psi, in US oilfield units
Schlumberger Ltd. (The World's Leading Supplier Of Technology, Integrated Project Management And Information Solutions to Customers Working in The Oil and Gas Industry Worldwide), Schlumberger Oilfield Glossary Cedex, France 2014. http://www.glossary.oilfield.slb.com/en/Terms/sym/ a.aspx, (Ergo - Brit) {766}