Atmospheric Pressure 15 : Natural Disaster. The weight of a 1 square inch column of the earth's atmosphere. At sea level this pressure is 14. 696 pounds per square inch
EESiFlo North America, Terminology and Glossary: HVAC Terms, Pennsylvania, USA 2002. flowmeterdirectory.com/flowmeter_terminology, (Heat, Vent and Air Cond - Amer) {553}