Page 139 - Instrumentation Reference Book 3E

Table 9.1 Pressure measurements
Pascal Bar Millibar Standard Kilogram Pound force Ton Milli- Milli- Inch of Inch of
atwlosphere force per per syuriw meter nzeter water nirvcury
square cni inch of water of mercury
Pa bar mbnr atnz kgflcm2 lbf in' mmH20 nznzHg inH20 inHg
Pa 1 10-5 10-2 9.86923 1.01972 1.450 38 7.500 62 1.01972 7.50062 4.01463 2.953 00
x 10-6 xlO-5 x 10-4 x 10-3 x lo-' 10-3 x10-3 x 10-4
bar 1 o5 1 1 o3 9.86923 1.01972 14.5038 7.500 62 1.019 72 7.500 62 4.0163 29.5300
x lo-' x 10-2 x 10-2 x 10-2 xlO-fi
mbar 102 10-3 1 9.86923 1.01972 1.450 38 7.500 62 1.01972 7.500 62 4.01462 2.953 00
x10-4 10-3 x 10-2 x 10-1 x 10 XI0 x10-' x 10-2
atm 1.01325 1.013 25 1.01325 1 1.033 23 1.469 59 7.60000 1.033 23 760 4.067 83 29.9213
x 105 x 103 x 10 x IO' x 105 x 102
kgf/cm2 98 066.5 0.980 665 980 665 0.967 841 1 14.2233 735.559 1 o4 7.355 59 3.937 00 28.9590
x 102 x 102 x 10'
Ibf/in2 6894.76 0.068 9476 68.9476 6.80460 7.030 70 1 51.7149 7.030 69 51.7149 27.6798 2.03602
x 10-2 10-2 x102
torr 133.322 1.333 22 1.333 22 1.31579 1.35951 1.933 68 1 13.5951 1 53.5240 3.93701
x 10-3 x 10-3 x 10-3 x 10-2 x 10-2
mmH20 9.806 65 9.80665 9.806 65 9.67841 10-4 1.422 33 7.355 59 1 7.355 59 3.93701 2.895 90
x10-5 x 10' x 10-5 x 10-3 x10-' x 10-2 x 10-2 10-3
mmHg 133.322 1.333 22 1.333 22 1.31 5 79 1.35951 1.933 68 1 13.5951 1 53.5240 3.93701
x 10-3 10-3 10-3 x 10-2 x 10-2
inH,O 249.089 2.490 89 2.490 89 2.458 31 2.54 3.61272 1.868 32 25.4 1.868 32 1 7.355 59
x10-3 x lo-' x 10-3 x 10-2 x 10-2
inHg 33.8639 3.38639 33.8639 3.342 11 3.453 16 0.491 154 25.4000 3.453 16 25.4000 13.5951 1
x 10-2 x 10-2 x 10-2 x 10-2
NB: Extracts from British Standards are reprodnced by permission of the British Standards Institution, 2 Park Street, London WIA 2BS rrom whom complete copies can be ohtained