“密度与社会生活”一课,是人教版八年级上册第六章《质量和密度》第四节内容,本节内容是在学生学习了质量和密度的基础知识以后,进一步探讨密度与社会生活的联系,是前三节内容的延伸和拓展。学生在地理课程中关于季风的章节已经知道暖空气轻,冷空气重,并且通过《物态变化》一章中“常见温度计测温原理”的学习,对物体热胀冷缩的性质有了一定的认识,为本节的学习奠定了知识基础。但是大部分学生对密度没有丰富的 “Density and social life ” a lesson, is the PEP eighth grade volume sixth chapter “quality and density,” the fourth section, this section is content in the students learn the basic knowledge of quality and density, to further explore the density The link with social life is the extension and expansion of the first three sections. Students in the geography course on the monsoon chapter already know the light warm air, cold air heavy, and through the “state changes” chapter “common thermometer temperature principle ” study, the nature of the objects have thermal expansion and contraction A certain understanding of this section laid the foundation for the study of knowledge. But most students are not rich in density