Krypton adsorption studies demonstrated an easily accessible system of pores in enamel, measuring between 10 and 300 A, volume 0.26%, with a surface area of about 0.4 sq m/gm (BET analysis). These figures are much lower than is suggested by figures for water content, possibly resulting from non-penetration of the organic matrix by krypton. Some measurements on demineralized enamel were also made.
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