Second derivative, d2E/dT2, μV K‒1 K‒1						Heat-capacity change, ΔCp
°C	Int	Abs48 & t48	Abs69 & t48	Abs69 & t68	σm(μV)	J K‒1 mol‒1	cal K‒1 mol‒1
0	‒3.100	‒3.101	‒3.102	‒3.104	0.010	‒163.62(.53)	‒39.11 (.13)
3	‒2.920	‒2.921	‒2.921	‒2.924	.008	‒155.80(.43)	‒ 37.24(.10)
5	‒2.800	‒2.801	‒2.801	‒2.803	.008	‒150.46(.43)	‒ 35.96(.10)
10	‒2.500	‒2.501	‒2.501	‒2.502	.006	‒136.72 (.33)	‒ 32.68(.08)
15	‒2.200	‒2.201	‒2.200	‒2.201	.003	‒122.40(.17)	‒ 29.25 (.04)
18	‒2.020	‒2.021	‒2.020	‒2.021	.001	‒113.52(.06)	‒ 27.13 (.01)
20	‒1.900	‒1.901	‒1.900	‒1.900	.001	‒107.49(.06)	‒ 25.69 (.01)
25	‒1.600	‒1.601	‒1.599	‒1.599	.001	‒ 92.00(.06)	‒ 21.99 (.01)
28	‒1.420	‒1.420	‒1.419	‒1.418	.002	‒ 82.43 (.11)	‒19.70 (.02)
30	‒1.300	‒1.300	‒1.299	‒1.298	.003	‒ 75.94(.18)	‒18.14(.04)
35	‒1.000	‒1.000	‒0.998	‒0.997	.006	‒ 59.29 (.35)	‒14.17(.09)
40	‒0.700	‒0.700	‒0.698	‒0.696	.008	‒ 42.06(.48)	‒ 10.05(.12)
43.6a	‒0.484	‒0.484	‒0.481	‒0.479	.009	‒ 29.30(.55)	‒ 7.00(.13)

^aAll values at 43.6 °C are extrapolated values.

^bBased on combined results obtained with chemically-prepared and dc-electrolytic mercurous sulfate; the values are 18.6 μV higher for dc-electrolytic mercurous sulfate alone.

^cHigher by 3.24 J mol⁻¹ for dc-electrolytic mercurous sulfate alone.

^dHigher by 0.77 cal mol⁻¹ for dc-electrolytic mercurous sulfate alone.