Application of the variational method in studying of polar liquids and their concentrated solutions

The developed new variational method for measuring the permittivity ξ' and dielectric losses ξ'' of polar liquids is free from a number of shortcomings. At which the minimum amplitude of the reflected wave (ρ) or the standing wave coefficient η takes place, and the value of ηm at this liquid thickness is based on measuring the thickness of the liquid layer in the cell. A variant of this method was considered in the assumption of the active value of the initial resistance of the waveguide section with liquid at the layer thickness corresponding to the minimum value of (ρ) or η, justified only for the case of polar liquids with low dielectric losses. Thus, polar liquids - cyclopentanol, cyclopentanone and their concentrated solutions in each other were studied for the first time, and variational method found a worthy application as the results showed.