Reference
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PRESSURE CONVERSION TABLE
Pressure
Unit Value
mm Hg (0 C)
in. Hg (0 C)
millibars
lb per sq. in.
lb per sq. ft.
grams/sq cm
in water (68 F)
mm mercury
(0 C) (torr)
1
25.400
0.75006
51.715
0.35913
0.73556
1.8650
in. mercury
(0 C) (32 F)
0.039370
1
0.029530
2.0360
0.014139
0.028959
0.073424
millibars
(mB) (hPa)
1.3332
33.864
1
68.948
0.47880
0.98067
2.4864
lb per sq in.
(psi)
0.019337
0.49115
0.014504
1
0.0069444
0.014223
0.036063
lb per sq ft.
(psf)
2.7845
70.726
2.0885
144
1
2.0482
5.1930
grams per
sq. cm
1.3595
34.532
1.0197
70.307
0.48824
1
2.5354
in water
(68 F) (20 C)
0.53620
13.620
0.40218
27.730
0.19257
0.39441
1
in water
(60 F)
0.53557
13.609
0.40186
27.707
0.19241
0.39409
0.99919
ft water
(50 F) (10 C)
0.044617
1.1333
0.033465
2.3073
0.016203
0.032818
0.083209
in water
(4 C) (39.2 F)
0.53525
13.595
0.40147
27.681
0.19223
0.39371
0.99823
cm water
(25 C) (77 F)
1.3635
34.634
1.0227
70.515
0.48969
1.0030
2.5430
cm water
( 20 C) (68 F)
1.3620
34.594
1.0215
70.433
0.48912
1.0018
2.5400
cm water
(4 C) (39.2 F)
1.3595
34.532
1.0197
70.309
0.48826
1.0000
2.5355
atmosphere
0.00131579
0.033421
0.00098692
0.068046
0.00047254
0.00096784
0.0024539
PRESSURE CONVERSION TABLE (Continued)
Pressure
Unit Value
in water
(60 F)
ft water
(50 F)
in water
(4 C)
cm water
(25 C)
cm water
(20 C)
cm water
(4 C)
atmosphere
mm mercury
(0 C) (torr)
1.8665
22.413
1.8683
0.73339
0.73424
0.73554
760
in. mercury
(0 C) (32 F)
0.073483
0.88241
0.073554
0.028874
0.028907
0.028958
29.9213
millibars
(mB) (hPa)
2.4884
29.882
2.4908
0.97777
0.97891
0.98064
1013.250
lb per sq in.
(psi)
0.036092
0.43340
0.036126
0.014181
0.014198
0.014223
14.69595
lb per sq ft.
(psf)
5.1972
62.409
5.2022
2.0421
2.0445
2.0481
2116.22
grams per
sq. cm
2.5375
30.471
2.5399
0.99705
0.99821
0.99997
1033.227
in water
(68 F) (20 C)
1.0008
12.018
1.0018
0.39324
0.39370
0.39440
407.51
in water
(60 F)
1
12.008
1.0010
0.39293
0.39338
0.39408
407.18
ft water
(50 F) (10 C)
0.083276
1
0.083356
0.032721
0.032759
0.032817
33.909
in water
(4 C) (39.2 F)
0.99904
11.997
1
0.39255
0.39301
0.39370
406.79
cm water
(25 C) (77 F)
2.5450
30.561
2.5475
1
1.0012
1.0029
1036.29
cm water
( 20 C) (68 F)
2.5421
30.526
2.5445
0.99884
1
1.0018
1035.08
cm water
(4 C) (39.2 F)
2.5376
30.492
2.5400
0.99707
0.99823
1
1033.26
atmosphere
0.0024559
0.029491
0.0024582
0.00096498
0.00096611
0.00096781
1