第八课

8 Why does the bicycle tire burst自行车胎为什么会爆裂

1. In general,Liquids have the properties of thermal expansion and contraction.一般情况下，液体有热胀冷缩的性质。

2. Do gases and solids have the properties of thermal expansion and contraction?气体、固体有没有热胀冷缩的性质呢？

3. Material table: Balloons, leather tendons, table tennis, etc材料表：气球、皮筋、乒乓球等

4. Activity process活动过程

5. Why is the bicycle tire easy to burst in the hot summer?在炎热的夏季，自行车胎为什么容易爆裂？

6. I thought the air in the tire would get hot···

我猜想车胎里的空气被晒热时会······

7. Do an experimental study. 做个实验研究一下吧。

8.  liquid column 液柱······

9. You can also try this.还可以这样试一试。

10. The gas has the property of heat expansion and contraction.气体有热胀冷缩的性质。

11. What is the change in volume when heated or cold? 固体在受热或遇冷是体积有什么变化？

12. At room temperature, the copper ball can pass through the iron ring.常温下，铜球能通过铁环。

13. Can the copper ball pass through the iron ring after heating and not as expected?铜球在受热和遇冷后都能通过铁环吗？

14. In general,Objects (liquids, solids, gases) have the properties of thermal expansion and contraction.一般情况下，物体（液体、固体、气体）具有热胀冷缩的性质。

15. Look for the phenomenon of thermal expansion and contraction. 找一找生活中物体热胀冷缩的现象。

16. I also know我还知道

17. Outreach activities拓展活动

18. Use the nature of thermal expansion of objects to make a "small fountain" . 利用物体热胀冷缩的性质做一个“小喷泉”。