Atmospheric Pressure 12 : Natural Disaster. The pressure exerted over the surface of the earth b the weight of the atmosphere. At sea level, this pressure is approximately 14.7 pounds per square inch (psi). (WLOP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}