
71
SECTION 16 a. APPENDIX A – ENGINEERING UNIT CONVERSION FACTORS
Multiply By
psi kg/cm² kPa MPa bar mbar
inH
2
O inH
2
O inH
2
O cmH
2
O cmH
2
O cmH
2
O mmH
2
O mmH
2
O mmH
2
O
inHg (0°C)
(0°C)
ftSW
From To (4°C) (20°C) (60°F) (4°C) (20°C) (60°F) (4°C) (20°C) (60°F)
or Torr
psi 1 0.070307 6.894757 0.006895 0.068948 68.94757 27.68067 27.72925 27.70759 703.0889 70.4323 70.37728 70.30889 7.04323 7.037728 2.03602 51.71492 2.245677
kg/cm² 14.22334 1 98.0665 0.098067 0.980665 980.665 393.7117 394.4027 394.0946 10000.28 1001.783 1001 1000.028 100.1783 100.1 28.95902 735.5591 31.94104
kPa 0.145038 0.010197 1 0.001 0.01 10 4.014742 4.021788 4.018647 101.9744 10.21534 10.20736 10.19744 1.021534 1.020736 0.2953 7.500615 0.325708
MPa 145.0377 10.19716 1000 1 10 10000 4014.742 4021.788 4018.647 101974.4 10215.34 10207.36 10197.44 1021.534 1020.736 295.2998 7500.615 325.7079
bar 14.50377 1.019716 100 0.1 1 1000 401.4742 402.1788 401.8647 10197.44 1021.534 1020.736 1019.744 102.1534 102.0736 29.52998 750.0615 32.57079
mbar 0.014504 0.00102 0.1 0.0001 0.001 1 0.401474 0.402179 0.401865 10.19744 1.021534 1.020736 1.019744 0.102153 0.102074 0.02953 0.750062 0.032571
inH
2
O (4°C; 39.2°F) 0.036126 0.00254 0.249082 0.000249 0.002491 2.49082 1 1.001755 1.000973 25.39999 2.544458 2.54247 2.539999 0.254446 0.254247 0.073554 1.868268 0.081128
inH
2
O (20°C) 0.036063 0.002535 0.248646 0.000249 0.002486 2.486456 0.998248 1 0.999219 25.3555 2.54 2.538016 2.53555 0.254 0.253802 0.073425 1.864995 0.080986
inH
2
O (60°F) 0.036091 0.002537 0.24884 0.000249 0.002488 2.4884 0.999028 1.000782 1 25.37532 2.541986 2.54 2.537532 0.254199 0.254 0.073482 1.866453 0.081049
cmH
2
O (4°C; 39.2°F) 0.001422 0.0001 0.009806 0.00000981 0.0000981 0.098064 0.03937 0.039439 0.039408 1 0.100176 0.100097 0.1 0.010018 0.01001 0.002896 0.073554 0.003194
cmH
2
O (20°C) 0.014198 0.000998 0.097892 0.0000979 0.000979 0.97892 0.393011 0.393701 0.393393 9.982478 1 0.999219 0.998248 0.1 0.099922 0.028907 0.73425 0.031884
cmH
2
O (60°F) 0.014209 0.000999 0.097969 0.000098 0.00098 0.979685 0.393318 0.394009 0.393701 9.990282 1.000782 1 0.999028 0.100078 0.1 0.02893 0.734824 0.031909
mmH
2
O (4°C; 39.2°F) 0.014223 0.001 0.098064 0.0000981 0.000981 0.980638 0.393701 0.394392 0.394084 10 1.001755 1.000973 1 0.100176 0.100097 0.028958 0.735539 0.03194
mmH
2
O (20°C) 0.14198 0.009982 0.97892 0.000979 0.009789 9.789198 3.93011 3.937008 3.933933 99.82478 10 9.992189 9.982478 1 0.999219 0.289075 7.3425 0.318842
mmH
2
O (60°F) 0.142091 0.00999 0.979685 0.00098 0.009797 9.79685 3.933183 3.940086 3.937008 99.90282 10.00782 10 9.990282 1.000782 1 0.289301 7.34824 0.319091
inHg (0°C) 0.491154 0.034532 3.386389 0.003386 0.033864 33.86389 13.59548 13.61934 13.6087 345.3251 34.59312 34.5661 34.53251 3.459312 3.45661 1 25.4 1.102974
mmHg (0°C) or Torr 0.019337 0.00136 0.133322 0.000133 0.001333 1.333224 0.535255 0.536194 0.535776 13.59548 1.361934 1.36087 1.359548 0.136193 0.136087 0.03937 1 0.043424
ftSW 0.4453 0.031308 3.070235 0.00307 0.030702 30.70235 12.3262 12.34784 12.33819 313.0855 31.3635 31.339 31.30855 3.13635 3.1339 0.90664 23.02865 1
mmHg
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