A pitcher with `1-mm` thick porous walls contain 10kg of water. ,Water comes to its outer surface and evaporates at the rate of `0.1gs^(-1)` . The surface area of the pitcher (one side) `=200cm^(2)` . The room temperature `=42^(@)C` , latent heat of vaporization `=2.27xx10^(6)Jkg^(-1)` , and the thermal conductivity of the porous walls `=0.80js^(-1)m^(-1)`^(@)C^(-1)` . Calculate the temperature of water in the pitcher when it attains a constant value.