Abstract
I AM interested to note that an attempt is being made to use a 'molecular flow' formula for the air permeability method instead of a corrected Poiseuille formula. I have been aware of this possibility and have derived an equation, based on the law of molecular flow through a tube at very low pressure, with a porosity function of the same form as that given by Holmes, namely,
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RIGDEN, P. [Letters to Editor]. Nature 157, 694 (1946). https://doi.org/10.1038/157694b0
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DOI: https://doi.org/10.1038/157694b0
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