Measuring Pressure

Common units of pressure:

• Pascal Pa
• Avg Air pressure at sea level 101,325
• Kilopascal kPa
• Avg Air pressure at sea level 101.325
• Atmosphere atm
• 1 exactly
• Millimeters of Mercury mmHg
• 760 exactly
• Inches of Mercury inHg
• 29.92
• Torr torr
• 760 exactly
• Pounds per square inch psi
• 14.7

CONVERT 688 mmHg to atm
688mmHg x (1atm/760mmHg) =  .905 atm

http://www.sengpielaudio.com/ConvPress.htm