A stainless steel (AISI 304) tube used to transport a chilled pharmaceutical has an inner diameter of 36 mm and a wall thickness of 2 mm. The pharma- ceutical and ambient air are at temperatures of 6°C and 23°C, respectively, while the corresponding inner and outer convection coefficients are 400 W/m². K and 6 W/m² K, respectively. (a) What is the heat gain per unit tube length? (b) What is the heat gain per unit length if a 10-mm- thick layer of calcium silicate insulation (Kins 0.050 W/m K) is applied to the tube?