氦气替换法测定煤的真相对密度

就氦气替换法测定煤的真相对密度进行了研究。6个国家一级标准煤样的测定值都在标准值的不确定度范围之内;方法的准确度与国家标准方法没有偏倚,精密度与国家标准规定一致。 Determination of true relative density of coal by helium replacement method was researched in this paper.The certified standard material determination results are all in the uncertainty of the standard value.The accuracy of this method has no bias and the precision consistent with the national standards