物质的密度及其测定安排在现行教材八年级下册中,由于涉及的知识点较多,长期以来对初中阶段的学生学习上形成了难点,而密度测定又是历年来中考几乎必考的技能之一,所以作为复习阶段的教师来说,要善于把密度测定的方法进行有机分类,把零散的“珠子”穿成线,并加以训练,方能提高学生解决此类问题的能力. The density of matter and its measurement are arranged in the eighth grade of the current textbook. Due to the large number of knowledge points involved, it has long been a challenge for students in junior secondary education, and density measurement is still a must-have skill in the examination for many years Therefore, as a teacher in the reviewing stage, it is necessary to be good at organically classifying the density determination methods and putting scattered “beads” into line and training them to enhance students’ abilities to solve such problems.