The effects of temperature on the solution viscosity of the oils of rubber seed, melon seed, and soyabean have been studied
in a number of organic solvents. The following temperatures were investigated: 30, 45, 60, 75 and 90 ◦C. A general decrease of
intrinsic viscosity [η] of oils is observed with increase in the temperature. This is attributed to the inability of oil molecules to
form thermally stable “molecular clusters” in solutions as the temperature is increased. For any given temperature studied, the
order in intrinsic viscosity observed for the oils in the hydrocarbon solvent is, toluene > xylene > benzene. For the alcoholic
solvents, the following order in intrinsic viscosity is observed, 1-hexanol > 1-pentanol > 1-butanol. Generally, solvents that
give high intrinsic viscosity values for the oils are observed to show low activation energy of viscous flow, Evis, and vice versa.