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  • Introduction to the Gas Laws
  • The Flow of Gases in Leaks
    • Viscous Flow
    • Types of Flow
    • Turbulent Flow
    • Laminar Flow
    • Calculation of an example
    • Viscosity of some gases
    • Conversion of helium leak rate at laminar flow to leak rates of other Gases
    • Molecular Flow
    • Conversion of helium leak rate to air leak rate
    • Conversion from weight leak rate to volume leak rate
    • Conversion of helium-leak rates at molecular flow to other gases
    • Transition flow
    • The Response Time
    • Example: Integral leak test on a heat-exchanger
    • The size of the leakrate signal after tn time constants in %
    • The Diffusion of Gases
    • Graham's Law of diffusion of Gases
    • Diffusion-Coefficients of some gases
    • Example: Diffusion of Search Gas in Air
    • Permeation
    • Helium Bombing Test
  • Helium Leak test on Heat Exchangers
  • Leak Detection and Measuring Methods
  • Leak Detection with Tracer Gas Methods
  • Leak Test with Laser Beam
  • Literature
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Viscosity of some gases

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Type of Gas
Air
Nitrogen
Oxygen
Argon
Hydrogen
Helium
Carbondioxide
R-12
R-22
R-134a
R-600a
Formular
 
N2
O2
Ar
H2
He
CO2
CCl2F2
CHClF2
CH2F-CF3
CH(CH3)2-CH3
Viscosity at 15°C in Pa·s
18.0 · 10-6
16.3 · 10-6
19.9 · 10-6
22.0 · 10-6
8.7 · 10-6
19.4 · 10-6
14.5 · 10-6
11.6 · 10-6
12.0 · 10-6
11.61 · 10-6
7.4 · 10-6

As one can see, the difference of viscosity between gases is not so large, all are in the same order of magnitude.

 
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