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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
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The Diffusion of Gases

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The spread of one gas into another gas is called "Diffusion". Of course diffusion happens also with fluids, but here we are interested in diffusion of gases. Under equal conditions, light gases diffuse faster than heavy gases. The diffusion of gases is inversely proportional to their relative molecular mass.

 
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