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A simple volumetric apparatus for the determination of the surface area of solid materials is described. Isotopically labelled krypton ( 85 Kr) is used as the adsorbate and the pressure measured using a combined counting cell and Geiger-Müller tube. The apparatus can be used to measure areas of 0.01 m 2 to 1 m 2 with a precision to 5% for 0.025 m 2 , 1% for 0.1 m 2 and 1.5% for 1 m 2 .
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Aylmore et al. (1961) studied this question.
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