一、引言 目前国内外液相过冷区PVT数据正式发表的不多,而且精度不高,这给液相区状态方程的研究及热力参数的计算带来困难。在PVT这三个基本量中,密度测量最为困难,迄今为至广泛采用的定容称重法,既繁琐又难于得到较好的结果。J.W.Beams及合作者首先提出了电磁悬浮法,近来日益受到重视和发展。本文作者在这样的背景下 I. INTRODUCTION At present, there are not many published PVT data in LCM at home and abroad, and the accuracy is not high, which makes it difficult to study the equation of state in the liquid phase and calculate the thermal parameters. Among the three basic PVTs, the density measurement is the most difficult. So far, the widely used constant volume weighing method is both cumbersome and difficult to obtain good results. J. W. Beams and co-workers first proposed the electromagnetic levitation method, which has drawn increasing attention and development recently. The author of this article in this context