九年义务教育六年制小学自然第九册《热传导》一课的教学重点是通过实验,使学生建立“水是不容易传导热”的这一概念。 《教学用书》的实验是“在一只试管里装上水,管底放上冰。为了防止冰浮上来,在冰上拴一小块石头,然后在靠近试管口水面部分进行加热。当水表面都沸腾了,试管底还是冷的,冰只是稍稍融化了一点”。这一实验有其不足之处:一是学生很难看清楚冰在试管底部是否融 Nine-Year Compulsory Education The six-year elementary school nature ninth book “heat conduction” a teaching focus is to experiment to enable students to establish the concept of “water is not easy to transmit heat.” The teaching book's experiment was “to put water in a test tube and put ice on the bottom of the tube, in order to prevent the ice from floating, attach a small piece of stone to the ice and then heat it near the surface of the test tube. The surface is boiling, the test tube is still cold, ice is just a little thawed. ” This experiment has its shortcomings: First, it is difficult for students to see if the ice melts at the bottom of the tube