A horizontal cylinder of 90 mm dia and 1 m length made of napthalene is kept in still air at 53°C. Estimate the weight loss in 60 minutes. The partial pressure of napthalene at this temperature is 1.333 × 102 Pa. M = 128, D = 6.11 × 10–6 m2/s, Sc = 3.077.
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