220

5250 (500)

a Viscosity at 20°C unless otherwise indicated.

Source: RH Perry, DW Green, eds. Perry's Chemical Engineers' Handbook. 7th ed. New York: McGraw-Hill, 1997. By permission.

a Viscosity at 20°C unless otherwise indicated.

Source: RH Perry, DW Green, eds. Perry's Chemical Engineers' Handbook. 7th ed. New York: McGraw-Hill, 1997. By permission.

Figure A-5 Nomograph for determining absolute viscosity of a gas near ambient pressure and relative viscosity of a gas compared with air. (Coordinates from Table A-7.) To convert from poise to pascal-seconds, multiply by 0.1. (From Beerman, Meas Control, June 1982, pp 154-157.)

The curves for hydrocarbon vapors and natural gases in the chart at the upper right are taken from Maxwell, the curves for all other gases (except helium) in the chart are based upon Sutherland's formula, as folloows:

where

Fluid

Approximate values of °C

O2 Air

0 0

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