ATS Pulmonary Function Laboratory Manual

ATS Pulmonary Function Laboratory Management & Procedure Manual | 3rd Edition

Table 21.1 Water Vapor Pressure: Table of the Vapor Pressure of Water (PH 2 O) in 1°C Increments from 10°C to 40°C. Pressure is in mm Hg and kPa Units (To Convert mm Hg to kPa, Multiply kPa by 7.5006) (1).

PH 2 O (mm Hg)

PH 2 (kPa)

O

PH 2 O (mm Hg)

PH 2 (kPa)

O

°C

°C

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

9.2 9.8

1.23 1.31 1.40 1.50 1.60 1.71 1.82 1.94 2.06 2.20 2.34 2.49 2.64 2.81 2.99

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

25.2 26.7 28.3 30.0 31.8 33.7 35.7 37.7 39.9 42.2 44.6 47.1 49.7 52.4 55.3

3.36 3.57 3.78 4.01 4.25 4.50 4.76 5.03 5.32 5.63 5.95 6.28 6.63 7.00 7.38

10.5 11.2 12.0 12.8 13.6 14.5 15.5 16.5 17.5 18.6 19.8 21.1 22.4

The equation used to calculate PH 2

O is (2):

[ 6 . 36 ( T − 37 ) 232 + T

]

PH 2 O = 47 . 07 × 10 , where: T = temperature in °C

References 1. Lide DR, editor. CRC handbook of chemistry and physics, 75th ed. Ann Arbor: CRC Press; 1994–1995. 2. Intermountain Thoracic Society. Clinical pulmonary function testing, 2nd ed. Salt Lake City: Intermountain Thoracic Society; 1984.

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