Table 4.

Measurement of density, viscosity and refractive index at various temperature.

Temp (K)	DES 1	DES 2	DES 3	DES 4	DES 5	DES 6
(a) Density (ρ) at different temperature
293	1.1183	1.1294	1.1231	1.135	1.1463	1.141
298	1.1153	1.1251	1.1196	1.131	1.1417	1.136
303	1.1115	1.1211	1.1158	1.127	1.1373	1.133
308	1.1083	1.1181	1.1129	1.123	1.1329	1.128
313	1.1049	1.1141	1.1093	1.119	1.1286	1.123
318	1.1011	1.1097	1.1051	1.114	1.1246	1.119
323	1.0961	1.1049	1.1001	1.11	1.1194	1.115
(b) Viscosity (µ) at different temperature
298	0.327	0.473	0.403	0.491	0.583	0.512
303	0.176	0.233	0.197	0.242	0.294	0.261
308	0.083	0.098	0.089	0.103	0.147	0.118
313	0.038	0.041	0.04	0.049	0.07	0.052
318	0.016	0.019	0.018	0.02	0.032	0.021
323	0.007	0.008	0.009	0.0093	0.013	0.009
(c) Refractive index (RI) at different temperature
293	1.311	1.332	1.326	1.292	1.32	1.3021
298	1.305	1.327	1.322	1.2869	1.314	1.2963
303	1.299	1.322	1.317	1.2824	1.31	1.2901
308	1.294	1.318	1.312	1.2765	1.304	1.2841
313	1.289	1.312	1.306	1.2727	1.298	1.2791
318	1.283	1.307	1.301	1.2681	1.293	1.2746
323	1.279	1.302	1.297	1.2635	1.288	1.2695

*(a) Standard uncertainty is u (T) = 0.1 K (0.63 confidence level) and expanded uncertainty of density is U (ρ) = 0.02 gcm⁻³.

*(b) Standard uncertainty is u (T) = 0.1 K (0.63 confidence level) and expanded uncertainty of density is U (µ) = 0.2 kgm⁻¹ s⁻¹.

*(c) Standard uncertainty is u (T) = 0.1 K (0.63 confidence level) and expanded uncertainty of density is U (RI) = 0.2.