第7课

7 The Secret of Thermometers温度计的秘密

1. When measuring the temperature of an object with a thermometer用温度计测量物体的温度时

2. The liquid column in the thermometer will rise or fall.温度计内的液柱会上升或者下降。

3. What's going on here?这是怎么回事呢？

4. Material package: red ink, vinegar, juice, leather tendons, etc.材料包：红墨水、醋、果汁、皮筋等。

5. Activity process活动过程

6. Why can a thermometer measure temperature?温度计为什么能测量温度？

7. There is liquid in the thermometer.温度计里有液体。

8. I guess the temperature changes when the liquid in the thermometer我猜温度改变时，温度计里的液体······

9. Try a device.做个装置试一试。

10. To see clearly, dye the water in the flask red.为了看得清楚，把烧瓶里的水染成红色。

11. Mind - based navigation思维导航

12. Put in hot water, what is the change of liquid column?放入热水中,液柱有什么变化?

13. What is the cold water in the liquid column? 放入冷水中,液柱有什么变化?

14. What does the experiment say? 实验说明了什么?

15. Try to see if other liquids have this change.试一试其他液体是否有这种变化。

16. Juice, alcohol, vinegar果汁、酒精、醋

17. In general, the volume of the liquid expands when heated and shrinks when it is not cold.一般情况下，液体受热时体积膨胀，遇冷时体积收缩。

18. This is the nature of liquid thermal expansion and contraction.这就是液体热胀冷缩的性质。

19. Liquid thermometers are made according to the properties of liquid thermal expansion and contraction.液体温度计是根据液体热胀冷缩的性质制成的。

20. Inquiry skills探究技能

21. According to water, vinegar, juice and other liquids,根据水、醋、果汁等液体具有热胀冷缩的性质，

22. The introduction of liquid has the property of thermal expansion and contraction, that is, reasoning.推出液体有热胀冷缩的性质，就是推理。

23. Outreach activities拓展活动

24. Why aren't the bottled drinks sold in the store full?商店里出售的瓶装饮料为什么不装满？

25. Check up the information and find out. 查阅资料，了解一下。