八年级物理上册2.4《学生实验:测量密度》学习要点课件北京课改版.ppt

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学生实验:测量密度 学习要点,(1)重点:用量筒测液体、不规则固体的体积 (2)难点:用天平和量筒测物质的密度,学习重难点:,学习要求:,(1)通过实验进一步巩固物质密度的概念 (2)会量筒的使用方法 (3)学会测量液体和固体的密度。学会间接地测定一个物理量的方法,培养严谨的科学态度,一、量筒,二、液体和固体密度的测量,要点目录,一、量筒,1、量筒,用来测量液体体积的工具,一般为玻璃制成,使用时注意轻拿轻放。,2、量筒的使用方法,(1)使用前要先观察量筒的量程(最大测量值)和分度值(每小格表示的体积值)。,(2)用量筒测量液体的体积。测量时要把量筒放在水平桌面上,读数时视线要与量筒中的液面的凹面(或凸面)相平。,1、原理,二、液体和固体密度的测量,由密度公式=m/V可知,要测量某种物质的密度,需要测量由这种物质构成的物体的质量和体积。,2、密度的测量,

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