...劝滇宪饥欤嘲裰放赣馥彰栝廴鸪拊卸尹靖排鬣糯涪哦牯侣荇锝蚴幕么 第四节 相对密度的测定 （Determination of Relative Density） 一、定义 相对密度系指在相同的温度下，某物质的密度与 水的密度之比。除另有规定外，均指20℃时的比值， 即d 20 20 。
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对烧结样的相对密度、抗拉强度、延伸率等性能进行了测定与分析。
Relative density, tensile strength and elongation of samples were also measured and analyzed.
从温度控制、空白试验、操作过程和加强管理等方面，阐述了如何在煤的真相对密度的测试过程中提高测定的准确度。
This paper discussed on how to improve the accuracy of coal true relative density measurement in temperature control, blank experiment, process control and enhancing management.
该方法适用范围广，测定结果准确，精密度高，相对误差小，在取样量范围里，测定结果不受取样量多寡的影响。
This method possessed wide applicability, accurate and exact result and less relative error. Besides, the determined result can not be affected in the weighable range of sampling.
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