Table 6. Experimental Speeds of Sound, w, for R1234yf (2,3,3,3-Tetrafluoroprop-1-ene), with the Combined Expanded (k = 2) Relative Uncertainty in the Speed of Sound, U_c, Also Given along with Relative Deviations from the Equation of State of Lemmon and Akasaka^41a,b.

T (K)	P (MPa)	W (m·s–1)	Uc (k = 2) (%)	100(w/wEOS – 1)
260.090	0.641	617.92	0.055	0.034
265.117	0.638	595.66	0.058	0.067
270.098	1.895	585.39	0.059	0.059
275.100	5.020	592.64	0.056	0.033
280.107	8.149	599.84	0.054	0.015
290.111	14.430	614.11	0.050	–0.012
300.105	20.638	627.61	0.047	–0.016
310.108	26.784	640.41	0.045	–0.011
320.146	32.869	652.60	0.043	–0.001
330.159	38.879	664.28	0.041	0.006
280.103	1.080	533.39	0.071	0.058
285.089	3.892	541.30	0.067	0.035
290.106	6.728	549.09	0.063	0.014
295.105	9.540	556.58	0.060	0.001
300.105	12.350	563.88	0.057	–0.008
310.109	17.923	577.75	0.053	–0.010
320.133	23.485	591.08	0.050	–0.004
330.123	28.982	603.71	0.047	0.003
340.118	34.401	615.63	0.045	0.017
350.119	39.760	627.01	0.043	0.028
360.126	45.057	637.89	0.042	0.035
370.138	50.278	648.27	0.040	0.037
300.100	0.715	437.61	0.109	–0.016
305.118	0.821	415.20	0.123	–0.059
310.104	0.938	392.78	0.140	–0.108
315.115	1.068	370.05	0.161	–0.162
320.127	2.166	365.95	0.161	–0.116
330.125	5.839	384.76	0.130	–0.025
340.116	9.517	401.52	0.108	–0.009
350.135	13.197	416.80	0.094	0.003
360.143	16.855	430.86	0.083	0.019
319.979	1.289	349.60	0.185	–0.174
324.983	3.063	359.82	0.163	–0.071
329.992	4.846	369.35	0.146	–0.023
334.981	6.621	378.20	0.132	–0.010
339.983	8.403	386.62	0.121	–0.007
344.992	10.185	394.64	0.111	0.000
349.990	11.966	402.33	0.103	0.004
355.010	13.754	409.76	0.095	0.007
359.996	15.527	416.85	0.089	0.015
235.010	0.637	729.97	0.043	–0.050
240.002	0.734	708.26	0.045	–0.023
245.003	4.676	714.03	0.044	–0.032
250.005	8.663	720.22	0.043	–0.036
254.995	12.624	726.36	0.042	–0.035
259.990	16.592	732.57	0.041	–0.033
250.001	1.049	666.04	0.049	0.004
254.996	4.746	672.67	0.047	–0.012
259.990	8.460	679.43	0.046	–0.024
264.997	12.253	686.64	0.044	–0.038
269.992	15.942	693.26	0.043	–0.032
259.988	1.012	621.58	0.054	0.031
264.995	4.401	628.57	0.052	0.007
269.992	7.791	635.56	0.050	–0.010
274.996	11.181	642.49	0.048	–0.019
280.000	14.563	649.33	0.047	–0.023
269.990	1.011	577.43	0.061	0.049
274.995	4.113	584.90	0.058	0.022
280.000	7.177	591.96	0.056	0.009
285.002	10.248	598.98	0.053	–0.005
290.020	13.339	606.04	0.051	–0.011
279.999	1.014	533.15	0.071	0.059
285.001	3.836	541.08	0.067	0.034
290.004	6.660	548.85	0.063	0.016
294.999	9.483	556.46	0.060	0.004
300.000	12.305	563.88	0.057	–0.003
290.002	1.002	488.16	0.085	0.045
294.998	3.566	496.79	0.079	0.030
300.003	6.159	505.32	0.074	0.007
305.000	8.776	513.87	0.069	–0.002
310.001	11.331	521.56	0.065	0.000
289.998	1.065	488.94	0.085	0.042
294.995	3.618	497.39	0.079	0.030
299.997	6.182	505.63	0.073	0.015
304.996	8.743	513.59	0.069	0.006
309.999	11.304	521.30	0.065	0.000
299.996	1.063	443.13	0.105	0.000
304.996	3.365	452.31	0.096	0.005
310.002	5.680	461.14	0.089	–0.001
314.994	7.997	469.68	0.082	–0.001
320.002	10.294	477.62	0.077	–0.002
309.996	1.242	398.58	0.134	–0.061
314.993	3.278	408.13	0.121	–0.023
320.003	5.328	417.23	0.110	–0.007
325.008	7.377	425.86	0.101	–0.001
329.998	9.417	434.05	0.093	0.004
320.001	1.356	351.05	0.183	–0.112
325.006	3.135	361.18	0.161	–0.027
330.014	4.921	370.57	0.144	–0.010
335.002	6.722	379.65	0.130	–0.016
340.006	8.495	387.97	0.119	0.025
330.012	1.732	306.16	0.256	–0.207
335.000	3.267	316.98	0.221	–0.016
340.007	4.814	327.03	0.193	0.106
345.011	6.373	336.21	0.172	0.084
350.008	7.969	345.18	0.153	–0.019
289.995	1.008	488.27	0.085	0.044
294.990	3.578	496.95	0.079	0.028
299.991	6.155	505.37	0.074	0.016
309.992	1.278	399.22	0.133	–0.054
319.997	5.380	418.02	0.109	0.001
329.995	9.489	434.97	0.093	0.008
340.005	13.584	450.38	0.081	0.017
350.007	17.663	464.70	0.073	0.029
359.997	21.713	478.08	0.066	0.050
369.991	25.751	490.77	0.061	0.068
289.991	0.994	488.14	0.085	0.052
294.989	3.557	496.76	0.079	0.038
299.991	6.128	505.12	0.074	0.025
304.991	8.697	513.20	0.069	0.015
309.993	11.264	521.00	0.066	0.010
329.995	1.753	307.02	0.255	–0.132
340.003	4.867	328.07	0.192	0.100
350.006	7.987	345.96	0.153	0.117
359.996	11.113	361.70	0.127	0.023
369.991	14.242	376.38	0.109	0.019
380.020	17.378	390.06	0.095	0.027
289.992	1.010	488.35	0.085	0.054
294.990	3.561	496.83	0.079	0.042
299.987	6.117	505.04	0.074	0.029
304.990	8.666	512.92	0.069	0.022
309.993	11.224	520.64	0.066	0.016

^aThe listed data are averaged from 12 measured echo-delay times (4 sets of 3 replicates each); see Supporting Information for unaveraged data. The data are listed in the order measured; blank lines separate measured isochores.

^bThe standard (k = 1) uncertainties in T and p are 0.005 K and (26 × 10^–6·p + 0.016 MPa), respectively.