Table 3.

The average dipole moment vector in Debye (D) and standard deviation of the distribution for the studied systems in a pure state and mixture at the considered temperatures in 0.1 MPa.

Average dipole moment (D)	Temperatures (K)
	293 K	321 K	400 K	Pure systems
$\stackrel{-}{\mathrm{D}}$ of Choline	3.12 $\pm$ 0.08	3.01 $\pm$ 0.07	3.16 $\pm$ 0.08	3.20 ± 0.02
$\stackrel{-}{\mathrm{D}1}$ of Phpr	1.57 $\pm$ 0.01	1.58 $\pm$ 0.01	1.64 $\pm$ 0.01	1.56 ± 0.01
$\stackrel{-}{\mathrm{D}2}$ of Phpr	5.63 $\pm$ 0.2	5.58 $\pm$ 0.2	5.53 $5.53\pm$ 0.2	–

With respect to the fact that the normalized distribution of dipole moment of Phpr have two Gaussian-typ behavior, therefore, two average dipole moment were reported ($\stackrel{-}{\mathrm{D}1}$ and $\stackrel{-}{\mathrm{D}2}$).