1. Dry air at 25°C and atmospheric pressure blows over a 30 cm2 surface of ice at a velocity of 1.5 m/s. Estimate the amount of moisture evaporated per hour, assuming that the block of ice is perfectly insulated except for the surface exposed to the air stream.
2. Helium gas at 25°C and 4 bar is contained in a glass cylinder of 100 mm inner diameter and 5 mm thickness. What is the rate of mass loss per unit length of the cylinder?
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