Table 4.
Third acoustic virial coefficient for 4He and its expanded (k = 2) uncertainty from the data of Gammon [25], excluding the isotherm at 348 K. Asterisks indicate fits including additional terms, as discussed in the text
|
T K |
RTγa cm6·mol−2 |
U(RTγa) cm6·mol−2 |
(RTγa)* cm6·mol−2 |
[U(RTγa)]* cm6·mol−2 |
|---|---|---|---|---|
| 98.15 | 153.2a | 1.0 | 155.1b | 2.5 |
| 123.16 | 106.0a,c | 6.3 | 115.3b | 10.5 |
| 148.16 | 77.5a | 1.0 | 80.7b | 2.5 |
| 173.16 | 57.8a | 2.1 | 57.9b | 8.0 |
| 198.16 | 32.4 | 4.1 | 42.8a | 1.6 |
| 223.16 | 22.4 | 2.3 | 27.0a | 10.2 |
| 248.16 | 17.1 | 0.9 | 20.9a | 3.7 |
| 273.15 | 8.2 | 1.3 | 13.8a | 5.3 |
| 298.15 | 7.3 | 6.9 | 21.2a | 27.4 |
| 323.13 | 0.4 | 4.7 | ||
| 373.13 | −3.8 | 11.9 | ||
| 398.15 | −13.5 | 40.5 | ||
| 423.15 | −10.4 | 26.0 |
a
Fit included the term δap3 / (RTlab).
b
Fit included the terms δap3 / (RTlab) and εap4 / (RTlab).
c
Not recommended.