ABSTRACT
T90 (K) t90 (°C) He VP 3 to 5 –270.15 to –268.15 e-H2 TP 13.8033 –259.3467 e-H2 (or He) VP (or CVGT) ≈17 ≈ –256.15 e-H2 (or He) VP (or CVGT) ≈20.3 ≈ –252.85 Nec TP 24.5561 –248.5939 O2 TP 54.3584 –218.7916 Ar TP 83.8058 –189.3442 Hgc TP 234.3156 –38.8344 H2O TP 273.16 0.01 Gac MP 302.9146 29.7646 Inc FP 429.7485 156.5985 Sn FP 505.078 231.928 Zn FP 692.677 419.527 Alc FP 933.473 660.323 Ag FP 1234.93 961.78 Au FP 1337.33 1064.18 Cuc FP 1357.77 1084.62
Values of Coefficients in the Vapor Pressure Equations for Helium
Coef. or constant
3He 0.65-3.2 K
4He 1.25-2.1768 K
4He 2.1768-5.0 K
A0 1.053 447 1.392 408 3.146 631 A1 0.980 106 0.527 153 1.357 655 A2 0.676 380 0.166 756 0.413 923 A3 0.372 692 0.050 988 0.091 159 A4 0.151 656 0.026 514 0.016 349 A5 –0.002 263 0.001 975 0.001 826 A6 0.006 596 –0.017 976 –0.004 325 A7 0.088 966 0.005 409 –0.004 973 A8 –0.004 770 0.013 259 0 A9 –0.054 943 0 0 B 7.3 5.6 10.3 C 4.3 2.9 1.9
