Isomorph theory prediction for the dielectric loss variation along an isochrone

Due to the unique design of our experimental setup, we obtain dielectric loss data where the amplitude is reproducible ± 0.1 %. We moreover find that the empty capacitance of the capacitor cell is stable within ± 0.3 % in our measuring range and can be assumed to be constant. Using this we predict for two isomorph states there is C2″(f) = C1″(f)(ρ1/ρ2)γ−1 to scale the imaginary capacitance, where C1 is the capacitance measurement at ambient pressure and C2 is the predicted capacitance at elevated pressure. We visually compare the predicted and measured plots and there is a good match between the two plots among the 42 pairs of isochronal states from the measurement.