鄂教版小学自然第五册《热胀冷缩》一课,通过对水、空气、铜质球的热胀冷缩实验,使学生认识到液体、气体、固体都有热胀冷缩的性质。在这组实验中,学生能通过自己设计的实验,清楚地看到水和空气受热膨胀,遇冷收缩这一现象变化的全过程。而铜质球热胀冷缩变化的全过程却看不到,所能看到的只是其热胀冷缩变化的结果,即铜质球受 The Eighth Edition of Primary and Secondary Natural Class “Thermal expansion and contraction” a class, through the water, air, copper ball thermal expansion and contraction experiments, so that students recognize the liquid, gas, solid have the nature of thermal expansion and contraction . In this group of experiments, students can clearly see the whole process of the phenomenon that water and air are heated and expanded and cooled and contracted by experiments designed by themselves. The copper ball thermal expansion and contraction of the whole process of change can not see what you can see is the result of its thermal expansion and contraction changes,