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