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Standard Atmospheric Pressure
Definition: A pressure of 1013.25 millibars (mb), 29.92 inches of mercury (Hg), 760 millimeters (mm) of mercury, 14.7 pounds per square inch (lb/in.^2), or 1013.25 hectopascals (hPa).
Source: Essentials of Meteorology: An Invitation to the Atmosphere (fifth edition) by C. Donald Ahrens