A soaked sponge is experiencing dry air flowing over its surface. The air is at 1 atm and zero relative humidity. Determine the difference in the air temperature and the surface temperature of the sponge, T Ts, when steady-state conditions are reached, if the sponge is soaked with (a) water, DAB = 2.42 105 m2 /s, and (b) ammonia, DAB = 2.6 105 m2 /s. Evaluate the properties of air, water, and ammonia at 20C, 10C, and 40C, respectively