MEASUREMENTS have been made on the adsorption of helium gas on charcoal between 4.2° and 1.78° K. We determined the quantity adsorbed at various pressures and various temperatures. At the same time we also observed the adsorption velocity.
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VAN ITTERBEEK, A., VAN DINGENEN, W. & BORGHS, J. Adsorption of Helium Gas on Active Charcoal between 4.2° and 1.78° K.. Nature 144, 249 (1939). https://doi.org/10.1038/144249a0