A wet t-shirt hung on a hanger has a total surface area of about 0.6 m2 . It loses water as follows:

time (min)               0            5        33         45

weight (g)               661        640  580        553

Calculate the flux of water vapor away from the shirt. If the saturation vapor pressure of the water is 20 mmHg (20 g/m3 ) and the room has a relative humidity of 30%, estimate the mass transfer coefficient from the t-shirt.