JAWChemist: Molecular Weight of a Petroleum Oil Calculated ...
The ASTM D2502 [1] standard test method uses kinematic viscosity measurements [2] in cSt of a petroleum oil at 100 ° F (V100, V1) and 210°F (V210, V2) to estimate its molecular weight. The method requires looking up an "H" function (H100=870*Log(Log(V1+)+154)) from a table based on the viscosity at 100°F.