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Example 13.8. Air is contained in a tyre tube of surface area 0.5 m2 and wall thickness 10 mm. The pressure of air drops from 2.2 bar to 2.18 bar in a period of 6 days. The solubility of air in the rubber is 0.072 m3 of air per m3 of rubber at 1 bar. Dete
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