During leakage-oil study the dynamic & distributed K factor concept has been suggested and proven. The oil passing out through the silica gel and water, the UOP K factor varies as functions of the oil and water flow rate, the quantity of silica gel the passed through, and the history of the leaked oil under isothermal and isobaric condition. And it was found from adsorption test of oil on silica gel that a component in C₁₁ boiling range was the most selectively adsorbed and was taken as a key component. The key component varies also with the q, W, G and t. The empirical equations obtained for these two key variables, K and the key component, could be used for evaluating the original location of the leakage oil source and the original characteristics of the leakage oil.
In this study other two empirical equations was developed ; by using these equations the UOP K factor and volume average boiling point can be predicted from volume average carbon number which can easily be calculated from the gas chromatograms of oils.