STATE EQUATION OF LIQUID-HE-4 FROM 0.8 TO 2.5K

被引:17
作者
ARP, VD
机构
[1] National Institute of Standards and Technology, Center for Chemical Engineering, Chemical Engineering Science Division, Boulder, Colorado
关键词
D O I
10.1007/BF00683459
中图分类号
O59 [应用物理学];
学科分类号
摘要
A state equation for liquid helium is constructed in the range from 0.8 K to about 2.5 K, based on density and temperature as independent parameters. The equation has been fitted to experimental PVT, specific heat, (∂P/∂T)v, sound velocity, and lambda line properties from 14 different authors to an accuracy comparable with reasonable experimental errors in the measured quantities. Inclusion of logarithmic terms leads to agreement with experimental data as close as 100 μK from the lambda line. It is found that the logarithmic amplitude ratio is not constant as a function of distance along the lambda line. A new determination of lambda line density is also presented. The equation is available in computer form. © 1990 Plenum Publishing Corporation.
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页码:93 / 114
页数:22
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