活动准备1.先查资料,再联系生活实际想一想:水在什么情况下结冰?2.让学生利用冰箱制成冰块若干:(如果天很冷,也可以到野外找一些冰块来。)3.每人准备广口瓶一只,装上大半瓶水;4.每人用一只小药瓶装满水,塞紧盖子,放入冰箱的冷冻室中,第二天再拿出,看看有什么现象发生。(如果天很冷,也可以放到室外过夜。) Activity Preparation 1. First check the information, and then contact the actual thinking: water under the conditions of freezing? 2. Let students use the refrigerator made of ice number: (If the weather is cold, you can also find some ice in the wild 3. Each person prepares a jar with a large bottle of water; 4. Each person uses a small bottle filled with water, plug the lid, into the freezer in the refrigerator, and then take the next day Out to see what happens. (If the weather is cold, you can also spend the night outdoors.)