Assume that dry air has a density of 1.05 kg/m3, and the diffusivity of water vapour in a certain kind of food wrapping (packaging) material is 0.277(10)-7 cm2/s. The food and surroundings are at a temperature of 57C and the equilibrium moisture content is 0.012 kg H20 per kg of air. The moisture in the food is 0.038 kg water per kg of dry food solids. The air outside the wrapped food has zero moisture. Estimate the loss (mg/day) of water vapour for a wrapping thickness of 0.11 mm and a wrapping surface area of 125 cm2