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第十七课

2021-6-10 17:35| 发布者: admin| 查看: 94| 评论: 0

摘要: .

Does air occupy space16空气占据空间吗

Elephant skin, pencil, milk and juice all occupy space. So, does air take up space?象皮、铅笔、牛奶、果汁都占据空间。那么，空气占据空间吗?

Material wrapping paper, mineral water bottle, balloon, etc材料包纸、矿泉水瓶、气球等

Activity process活动过程

What do you find when you pour water quickly?●快速倒水，有什么发现?

Water doesn't flow easily into the bottle水不容易流进瓶内

I guess我猜想....

Thinking Guide思维导

1. 1. It is difficult for water to flow into the bottle. Who hinders the flow of water?水难以流进瓶内，是谁阻碍了水的流动?

2. what should be done to make water flow into the bottle quickly?2.要使水很快地流进瓶里，应该怎么做?

3. 3.3. What does the above phenomenon show?3.上述现象说明什么?

Air always occupies a certain space.空气总是占据一定的空间。

Do the experiment of small space occupied by air●做空气占据空间小实验

Boli cup must go down directly, and then catch it vertically波璃杯一定要直接下去，再竖直捉起来

How can I blow the balloon up?怎样才能把气球吹起来?

Development activities拓展活动

Look for the phenomenon of air occupying space in life.找一找生活中空气占据空间的现象。

17 volume and mass of gas17气体的体积和质量

Square wood block, magic square, glass ball, etc. have fixed volume and determined quality.方木块、魔方、玻璃球等都有固定的体积和确定的质量。

Does air also have a fixed volume and a definite mass?空气也大固定的体积和确定的质量吗?

Rubber, needle, volleyball, etc橡皮、球针、排球等

Activity process活动过程

Can the volume of air be changed?●空气的体积可以改变吗?

I find....我发现....

Gas has no fixed volume,气体没有固定的体积，

● is there a definite quality of air?●空气有确定的质量吗?

Let the air out and weigh it把气放出来，再称称

Let the air out and weigh it维导思航

1. what is the quality of volleyball with sufficient air?1.充足气的排球质量是多少?

2. What is the quality of volleyball after exhaust? What does it mean?2.排出气后的排球质量是多少?说明什么?

index card for files资料卡

According to records, Italian scientist Galileo made a covered container that can keep the air inside from leaking out. He pumped air into the container with a hand pump to fill the container with air. Then first weigh the mass of the container at this time, and then open the lid to let out the air, and then weigh the mass again. After comparing the results, Galileo found that the mass of the container decreased after the air was released.据记载，意大利科学家伽利略制作了一个可以让内部的空气无法漏出的带盖客器，用手压泵向容器中打气，使容器中装满空气。接着先称出容器此时的质量，然后打开盖子放出空气，再称一次质量。比较结果后，伽利略发现:放出空气后，容器质量减少了。

The gas has a definite mass.气体有确定的质量。

Development activities拓展活动

Understand the making method of "air gun" and make an "air gun".了解“空气炮”的制作方法，制作一个“空气炮”。

Unit evaluation单元评价

There is a definite quality有确定的质量

Characteristic solid特征固体

There is no fixed volume没有固定的体积

The form of an object物体的形态

Gas characteristics气体特征

There is no fixed shape没有固定的形状

Characteristic liquid特征液体

The palace of undergraduate studies本科学殿堂