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- Example 4 : [One-way diffusion] Water in the bottom of a narrow metal tube is held at a constant temperature of 293K. The total

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- Example 4 : [One-way diffusion] Water in the bottom of a narrow metal tube is held at a constant temperature of 293K. The total pressure of air (assumed dry) is 1.01325105Pa(1.0atm) and the temperature is 293K (20C). The vapor pressure of water at 20C is 17.54mmHg. Water evaporates and diffuses through the air in the tube, and the diffusion path z2z1 is 0.1524m(0.5ft) long. Calculate the rate diffusivity of water vapor at 293K and 1am pressure is 0.250x 104m2/s. Assume that the system is isothermal. Use SI and

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