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Equivalency Chart
 
Equivalent Inches Pressure Per
Square Inch		 Equivalent Inches Pressure Per
Square Inch
Water Mercury Pounds Ounces Water Mercury Pounds Ounces
               
0.10 0.007 0.0036 0.0577 10.0 0.74 0.361 5.77
0.20 0.015 0.0072 0.115 11.0 0.81 0.397 6.34
0.30 0.022 0.0108 4.173 12.0 0.88 0.433 6.92
0.40 0.029 0.0145 0.231 13.0 0.96 0.469 7.50
   
0.50 0.037 0.0181 0.289 13.6 1.00 0.491 7.86
0.60 0.044 0.0217 0.346 13.9 1.02 0.500 8.00
0.70 0.051 0.0253 0.404 14.0 1.06 0.505 8.08
0.80 0.059 0.0289 0.462        
0.90 0.066 0.325 0.520 15.0 1.10 0.542 8.7
1.00 0.074 0.036 0.577 17.0 1.25 0.614 9.8
1.36 0.100 0.049 0.785 18.0 1.33 0.650 10.4
1.74 0.128 0.067 1.00 19.00 1.40 0.686 10.9
2.00 0.147 0.072 1.15  
2.77 0.203 0.100 1.60 20.0 1.47 0.722 11.5
3.00 0.221 0.109 1.73  
4.00 0.294 0.144 2.31 25.0 1.84 0.903 14.4
  27.2 2.00 0.975 15.7
5.0 0.368 0.181 2.89 27.7 2.03 1.00 16.0
6.0 0.442 0.217 3.46        
7.0 0.515 0.253 4.04        
8.0 0.588 0.289 4.62        
9.0 0.662 0.325 5.20        
 

COMPRESSION RATIO
OR
PRESSURE RATIO
 
ABSOLUTE DISCHARGE PRESSURE
ABSOLUTE SUCTION PRESSURE		 = PRESSURE RATIO
         
GAUGE PRESSURE + 14.75 LBS = ABSOLUTE PRESSURE		  
 
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