In this work, dynamic viscosities of hydrocarbons and ionic liquids are studied. At high temperatures in these materials, a decrease in the value of dynamic viscosity was observed. Intermolecular interactions in the objects of study have been studied. It has been established that the intermolecular interaction in hydrocarbons is determined by the Born potential ([Formula: see text]. In this case, the temperature dependence of the dynamic viscosity of hydrocarbons is described by the law [Formula: see text]. It has been established that the dynamic viscosity of hydrocarbons in liquid form has a non-activating character. This occurs directly due to momentum transfer by phonons between adjacent layers located at a distance of nanometers.

In this study, the dynamic viscosity of hydrocarbons was studied. This study was carried out with phenomenological aspects. The objects that were selected for this study are as follows: Cyclopentane, methylcyclopentane, ethylcyclopentane, propylcyclopentane, cyclohexane, methylcyclohexane and ethylcyclohexane. The studies were carried out in the temperature range [Formula: see text]–373 K. It has been established that with the increasing temperature, the value of the dynamic viscosity of hydrocarbons decreases. In these materials, the mechanism of change in dynamic viscosity at high temperatures has been studied.