POUNDS PER SQUARE INCH (PSI) A unit for measuring pressure. One PSI equals the pressure resulting from a force of one pound force acting over an area of one square inch.
That means pressure applied by this air on the unit area would be 14.7 pounds per square inch. Meteorologists use a metric unit for pressure called a millibar and the average pressure at sea level is 1013.25 millibars.
Standard atmospheric pressure A pressure of 1013.26 millibars (mb), 29.92 inches of mercury (Hg), 760 millimeters (mm) of mercury, 14.7 pounds per square inch (lb/in.2), 101,326 pascals (Pa).
A column of air in cross section, measured from sea level to the top of the atmosphere, would weigh approximately 14.7 pounds per square inch (psi). The standard value for atmospheric pressure at sea level is: 29.92 inches or 760mm of mercury; 1013.
The measurement of one atmosphere of pressure under standard conditions. It is equivalent to 1,013.25 millibars, 29.92 inches of mercury, 760 millimeters of mercury, 14.7 pounds per square inch, or 1.033 grams per square centimeter.
Standard Atmospheric Pressure - the pressure exerted by a 760 millimeter column of mercury at sea level at a temperature of 0 degrees Celsius; equal to 1013.25 millibars (mb), 29.92 inches of mercury (in of Hg), or 14.7 pounds per square inch ...
Often referred to as mean sea level, or MSL. Elevation and altitude is often measured relative to sea level. Normal mean sea-level pressure, or MSLP, is 1016 mb, or 30" of mercury (14.7 pounds per square inch).
Disk hardness gauge An instrument for measuring snow hardness in terms of the resistance of snow to the pressure exerted by a disk attached to a spring-loaded rod, a gauge calibrated in pounds per square inch registers the amount of resistance.
 See also: Weather, Pressure, Air, Surface, Meteor
  
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