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An adult human being utilizes approximately 8.4e-6 kg/s of oxygen (O2) and the diffusivity of O2 in air is approximately 1.8e-5 m2/s . The concentration of O2 in room temperature air at atmospheric pressure is 0.28 kg/m³. If human safety is imperiled when the O2 concentration reaches 0.28 kg/m³, estimate the opening size needed in the 10-cm-thick exterior wall of a fully-enclosed chamber, lacking forced-air ventilation, that will allow constant occupancy by one person (see Figure). A interior I exterior f

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