Helium Leak Testing

[michtigz]

Why use Helium for plant leak testing instead of Nitrogen? What is the criteria for using Helium.

[Marty Thompson]

Helium - Atomic mass: 4.002602 ± 0.000002 u

Nitrogen - Atomic mass: 14.0067 ± 0.0001 u

The smaller gas particle of helium passes through smaller holes.

[Marty Thompson]

Helium - Atomic mass: 4.002602 ± 0.000002 u

Nitrogen - Atomic mass: 14.0067 ± 0.0001 u

The smaller gas particle of helium passes through smaller holes.