Abstract
IN recent communications in Nature1, the hundredfold discrepancy between two methods of estimating the surface area of coals was discussed; I put forward the view that the low-temperature adsorption of nitrogen under-estimated the area very considerably, and made the suggestion that, since the pore constrictions of coals at ordinary temperatures are comparable with molecular dimensions, the anomaly might arise from a reduced accessibility of the internal surface at liquid-air temperatures.
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References
Dryden, I. G. C., Nature [169, 269 (1952)]. Maggs, F. A. P., Nature, [169, 269 (1952)]. Lecky, J. A., Hall, W. K., and Anderson, R. B., Nature, 168, 124 (1951).
Malherbe, P. le R., Fuel, 30, 97 (1951).
Bangham, D. H., Franklin, R. E., Hirst, W., and Maggs, F. A. P., Fuel, 28, 231 (1949).
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MAGGS, F. Anomalous Adsorption of Nitrogen at 90° K.. Nature 169, 793–794 (1952). https://doi.org/10.1038/169793a0
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DOI: https://doi.org/10.1038/169793a0
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