A 1-mm-thick square (100 mm x 100 mm) sheet of polymer is suspended from a precision scale in a chamber characterized by a temperature and relative humidity of T = 300 K and cp = 0, respectively. Suddenly, at time t = 0, the chamber's relative humidity is raised to cp = 0.95. The measured mass of the sheet increases by 0.012 mg over 24 hours and by 0.016 mg over 48 hours. Determine the solubility and mass diffusivity of water vapor in the polymer. Preliminary experiments have indicated that the mass diffusivity is greater than 7 x 10^-13 m²/s.