Index of Semiconductor Process Gases - Helium by National Institute of Standards and Technology (source code)

= Index of Semiconductor Process Gases - Helium by National Institute of Standards and Technology
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https://www.nist.gov/pml/sensor-science/fluid-metrology/database-thermophysical-properties-gases-used-semiconductor-9

The helium-4 characteristic-property table gives a normal boiling point of 4.224 K and a critical <temperature> of 5.2 K.