第十四课

Unit 4 form of objects第四单元  物体的形态

Table, stone and glass have fixed shapes. Milk, coffee and juice flow. Air can't be seen or touched. What are the shapes of objects? Let's get to know each other.桌子、石块、玻璃是有固定形状的，牛奶、咖啡、果汁是流动的，空气是看不见、摸不着的....物体的形态有哪些?让我们一起去认识吧。

14 solids, liquids and gases14固体、液体和气体

Rubber and textbooks can be put on the desk directly. Why should ink be put in a bottle to put on the desk?橡皮、课本能直接放在课桌上，墨水为什么要装在瓶子里才能放在课桌上呢?

Stones, nuts, wooden blocks, toothpicks, milk, vinegar, plastic bags, etc.石块、螺母、木块、牙签、牛奶、醋、塑料袋等。

Activity process活动过程

● identify solids, liquids and gases.●识别固体、液体和气体。

Milk compared with stone牛奶和石头相比.....

Try to classify them.试着给它们分类。

Touch, pinch摸一摸、捏一捏.....

Things like water, milk, and customs belong to liquids;像水、牛奶、關这样的物休属房于液体;

Objects like air belong to gas. Like stones, blocks, nuts的物体属于回体:像空气这样样的物体属于气体。像石头、木块、螺母这样

● compare the shapes of solids, liquids and gases●比较固体、 液体和气体的形状

The milk is running out牛奶流出来了

Where is the air?空气去哪儿了?

The shape of the block is木块的形状是.....

A solid has a fixed shape and cannot flow. Liquids and gases have no fixed shape and can flow.固体有固定的形状，不能流动。液体和气体没有固定的形状，能流动。

What do you find when you tilt the object?●把物体倾斜放置，有什么发现?

I found the surface of the liquid我发现液体的表面....

The surface of a liquid generally remains horizontal when it is still.液体的表面在静止时一般会保持水平。

Development activities拓展活动

Learn how people in life determine that two points on the wall are on a horizontal plane了解生活中人们是如何确定墙上的两个点在一个水平面的、