一、前言 比重是矿物的一个重要物理常数。迄今为止,测量比重已有多种经典方法。但对于测量微小矿物比重及扩大比重测量范围,已有的方法已不能满足要求。为此,笔者利用六十年代后发展起来的磁流体新技术,利用对于仅在垂直方向上有梯度变化的磁场中,顺磁性液体具有“按比重分层的现象”这 First, the foreword Proportion of minerals is an important physical constant. To date, there have been many classical methods of measuring gravity. However, the existing methods can not meet the requirements for measuring the specific gravity of micro-minerals and expanding the measurement range of specific gravity. Therefore, the author uses the new magnetic fluid technology developed after the 1960s to make use of the phenomenon that paramagnetic liquids have “stratified by proportion” in a magnetic field that has only a gradient in the vertical direction.