SAE-30 oil at 80-C occupies the space between two cylinders, 2 and 2.2 cm in diameter. The outer cylinder is stationary and the inner cylinder rotates at 100 rpm. Is the oil in a laminar or turbulent state if Recrit ¼ 1700? Use Re ¼ or1d=n, where d ¼ r2 2 r1.