Table 3. Values of the Speed of Sound, c, and Apparent Molar Isentropic Compression, K_ϕ, s, of Glycols in Aqueous Solutions of Glycerol at Different Temperatures.

	c/(m·s–1)				Kϕ, s×1015/(m3·mol–1·Pa–1)
mA/(mol·kg–1)a	T = 293.15 K	T = 298.15 K	T = 303.15 K	T = 308.15 K	T = 293.15 K	T = 298.15 K	T = 303.15 K	T = 308.15 K
0.00 mol·kg–1 Niacin + PG
0.00000	1481.0	1495.0	1508.0	1519.0b
0.09917	1486.0	1500.0	1513.0	1523.0	–42.62	–44.25	–43.49	–42.90b
0.19801	1490.0	1504.0	1516.0	1526.0	–42.86	–44.49	–43.72	–43.13
0.30136	1493.0	1507.0	1520.0	1529.0	–42.95	–44.58	–43.81	–43.22
0.39826	1496.0	1510.0	1522.0	1532.0	–42.99	–44.62	–43.86	–43.27
0.51059	1499.0	1513.0	1525.0	1534.0	–43.03	–44.66	–43.89	–43.30
0.01 mol·kg–1 Niacin + PG
0.00000	1483.6	1497.2	1509.4	1519.9
0.09995	1488.2	1502.1	1514.4	1524.2	–44.99	–44.18	–43.47	–42.86
0.20005	1492.2	1506.1	1517.6	1527.4	–45.23	–44.41	–43.70	–43.09
0.30106	1495.3	1509.5	1521.7	1530.3	–45.32	–44.50	–43.78	–43.18
0.39996	1498.4	1512.8	1523.9	1533.4	–45.36	–44.55	–43.83	–43.22
0.50512	1501.5	1515.6	1526.7	1535.1	–45.40	–44.58	–43.86	–43.26
0.03 mol·kg–1 Niacin + PG
0.00000	1485.6	1498.8	1511.1	1521.5
0.10024	1490.4	1503.7	1515.9	1525.8	–44.87	–44.09	–43.37	–42.78
0.19987	1494.4	1507.8	1519.1	1528.8	–45.11	–44.32	–43.60	–43.00
0.29998	1497.5	1511.4	1523.1	1531.9	–45.19	–44.41	–43.68	–43.09
0.40018	1500.7	1514.9	1525.9	1535.1	–45.24	–44.45	–43.73	–43.14
0.50113	1503.8	1517.6	1528.5	1536.9	–45.28	–44.49	–43.77	–43.17
0.05 mol·kg–1 Niacin + PG
0.00000	1487.3	1500.6	1512.8	1523.2
0.09981	1492.0	1505.5	1517.6	1527.6	–44.77	–43.98	–43.27	–42.68
0.20212	1496.3	1509.8	1520.9	1530.8	–45.01	–44.22	–43.51	–42.91
0.29999	1499.4	1513.4	1524.8	1533.9	–45.10	–44.30	–43.59	–42.99
0.40004	1502.7	1517.0	1527.7	1536.8	–45.15	–44.35	–43.64	–43.04
0.50220	1506.1	1519.6	1530.4	1538.7	–45.18	–44.38	–43.67	–43.07
0.00 mol·kg–1 Niacin + HG
0.00000	1481.0	1495.0	1508.0	1519.0b
0.09903	1490.0	1504.0	1515.0	1525.0	–45.13	–44.25	–43.49	–42.90b
0.20184	1500.0	1512.0	1523.0	1533.0	–45.38	–44.49	–43.72	–43.13
0.29963	1508.0	1520.0	1531.0	1539.0	–45.46	–44.57	–43.80	–43.21
0.39805	1517.0	1528.0	1537.0	1545.0	–45.50	–44.61	–43.85	–43.26
0.49538	1523.0	1535.0	1543.0	1551.0	–45.53	–44.64	–43.88	–43.29
0.01 mol·kg–1 Niacin + HG
0.00000	1483.6	1497.2	1509.4	1519.9
0.09899	1492.5	1505.9	1517.0	1526.1	–44.98	–44.17	–43.46	–42.86
0.20067	1502.4	1514.1	1525.0	1534.2	–45.23	–44.41	–43.69	–43.09
0.30008	1511.1	1522.2	1533.2	1540.1	–45.31	–44.49	–43.78	–43.17
0.40023	1519.9	1530.3	1539.1	1546.2	–45.36	–44.54	–43.82	–43.22
0.50001	1525.6	1537.4	1545.1	1552.4	–45.39	–44.57	–43.85	–43.25
0.03 mol·kg–1 Niacin + HG
0.00000	1485.6	1498.8	1511.1	1521.5
0.10055	1494.7	1507.2	1519.1	1527.5	–44.87	–44.09	–43.37	–42.78
0.19998	1504.7	1515.2	1526.5	1535.4	–45.10	–44.32	–43.60	–43.01
0.30034	1513.6	1523.4	1534.8	1541.5	–45.19	–44.40	–43.68	–43.09
0.40009	1522.6	1531.3	1540.5	1547.8	–45.24	–44.45	–43.73	–43.14
0.50210	1528.9	1539.3	1547.3	1553.9	–45.27	–44.48	–43.76	–43.17
0.05 mol·kg–1 Niacin + HG
0.00000	1487.3	1500.6	1512.8	1523.2
0.09995	1496.4	1508.5	1520.7	1529.4	–44.77	–43.98	–43.27	–42.68
0.20002	1505.9	1516.7	1528.3	1537.6	–45.01	–44.21	–43.50	–42.91
0.30172	1515.2	1524.9	1536.9	1543.6	–45.09	–44.30	–43.59	–42.99
0.40059	1523.9	1532.5	1542.7	1549.9	–45.14	–44.34	–43.64	–43.04
0.50009	1530.4	1540.4	1549.4	1555.7	–45.17	–44.37	–43.67	–43.08

^am_A is the molality of glycols in the aqueous solution niacin; standard uncertainties u are u(m) = 2 × 10^–5 mol·kg^–1, u(T) = 0.05 K, u(ρ) = 0.06 (kg·m^–3), u(p) = 0.01 MPa, u(c) = 0.6 m·s^–1, and u(K_ϕ, S) = ±0.25×10⁶/(m³·mol^–1·GPa^–1).

^bValues of speed of sound for (PG + water and HG + water) at temperatures of 293.15 and 308.15 K have been taken from our previous paper.¹³