Example E3-7 Calculate the kinematic viscosities and the refractive index for oil which has a MeABP of 320 C and API gravity of 34. Solution: The boiling point is 593.15 K or 1067.7 R. Using equations (3.2) and (3.5), the specific gravity is 0.855 and the Watson K factor is 11.95. From equations (3.12) and (3.13) V100 = 5.777 cSt and Y210 = 1.906 cSt. From equations (3.14) and (3.15), the refractive index n is calculated to be 1.481 (M is 257.1 as calculated from equation (3.11))