Oil at \(150^{\circ} \mathrm{C}\) flows slowly through a long, thin-walled pipe of 35-mm inner diameter. The pipe is suspended in a room for which the air temperature is \(25^{\circ} \mathrm{C}\) and the convection coefficient at the outer tube surface is \(12 \mathrm{~W} / \mathrm{m}^{2} \cdot \mathrm{K}\). Estimate the rate of heat loss per unit length of tube.