第十八课

18  The three states of water水的三种状态

1. Have you ever made sorbet?你制作过冰糕吗？

2. How did you make it?你是怎么做的？

3. Material kit: small iron bucket, ice cubes, plastic cups, salt, etc.材料包：小铁桶、冰块、塑料杯、食盐等。

4. Task card: prepare a cup of water and mark the water level任务卡：准备一杯水，在水位处做好标记

5. Put it in the freezer and take it out after a while to observe.放入冰箱冷冻，过一段时间取出来观察。

6. activity process活动过程

7. Under what conditions will water freeze?水在什么条件下会结冰？

8. What happens when water freezes?水结冰时会有什么变化？

9. let's make ice.我们来制作冰。

10. The water is starting to freeze.水开始结冰了。

11. The temperature of water when it freezes ------水结冰时的温度······

12. Method guide方法指导

13. Add a small amount of water to a plastic cup and place the cup in a small metal bucket.向塑料杯中加入少量水，并把塑料杯放在小铁桶中。

14. Put a large amount of ice cubes into the small metal bucket and let the ice cubes wrap around the plastic cup.向小铁桶内放入大量冰块，让冰块包裹在塑料杯的周围。

15. Sprinkle salt on the ice cubes.向冰块上撒食盐。

16. Place in the freezer to freeze the volume of water ------放入冰箱冷冻后，水的体积······

17. put in and forward.放入并向前，

18. After being placed in the refrigerator for some time放入冰箱一段时间后

19. In general, water freezes when the temperature drops to 0°C. The volume of water expands when it freezes.一般情况下，当温度降低到0℃时，水会结冰。水结冰时体积会膨胀。

20. How many states does water have in nature?水在自然界中有几种状态？

21. What are the differences in their shapes and volumes?它们的形状和体积有什么区别？

22. ice, water, water vapor冰、水、水蒸气

23. Water does not have a fixed shape.水没有固定的形状。

24. Water vapor does not have a fixed volume.水蒸气没有固定的体积。

25. What is the relationship between them?它们之间有什么关系？

26. Water exists in nature in the form of ice, water, and water vapor.水在自然界以冰、水、水蒸气的形式存在。

27. They are in different states, though它们虽然状态不同，

28. but they are all the same kind of substance.但都是同一种物质。

29. The three states of water can be transformed into each other.水的三种状态可以相互转化。

30. I also know ------我还知道······

31. Refrigeration, artificial precipitation冷冻、人工降水

32. extension activities拓展活动

33. find out what solid water is in its natural state找一找自然状态下有哪些固态的水

34. Hall of Science科学殿堂

35. In winter, when you wear glasses from outside into a warm house冬天，戴着眼镜从外面进到温暖的屋内，

36. A layer of fog will form on your glasses.眼镜上就会起一层雾。

37. What is going on here?这是怎么回事？

38. space for reflection反思空间

39. what I get我的收获

40. water vapor is invisible.水蒸气是看不见的。

41. what I need to improve我需要改进的

42. the experiment of water vapor condensing into water.水蒸气凝结成水的实验。

43. that I want to continue to explore我想继续探究的

44. Can ice be turned directly into water vapor?冰可以直接变成水蒸气吗？