"Why does the water level rise?" Drinking water PPT courseware

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"Why does the water level rise?" Drinking water PPT courseware

Review import

Please recall, students, what phenomena will we observe during the experiment of boiling water?

As the water temperature rises, the water surface gradually rises, the bottom of the water gradually bubbles, and when heated to a certain point, the water surface emits white gas, the water boils for a while, and the water becomes less.

friendly reminder:

1. Observe the experimental phenomena carefully and fill in the record sheet 1.

2. Repeat the experiment to see if the results are the same as the first experiment?

3. The hot water temperature is very high, please pay attention to safety!

What phenomenon was observed? What do these phenomena indicate?

When water is heated, the water level rises, and when water is cooled, the water level drops.

These phenomena explain that the volume of water increases when heated and shrinks when cooled.

The volume of water increases when it is heated and decreases when it is cooled. Do other objects also have such characteristics? Choose appropriate materials and find ways to conduct research.

Discussion points

1. What to use to hold air and how much air to hold?

2. How can we use these materials to see the volume of air change?

Think seriously

(1) Will the volume of the copper ball expand after being heated?

(2) How can we know that the copper ball has expanded in volume after being heated?

Analyzing the above series of experimental phenomena, what are the findings? Write down the results of your discussion.

Generally speaking, when most objects are heated, their volume will increase; when they are cooled, their volume will shrink. This phenomenon is called thermal expansion and contraction.

Practical application, expansion and extension

Do you know any other examples of thermal expansion and contraction in life? Share it with everyone! ! !

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Update Time: 2024-11-22

This template belongs to science courseware E-education edition third grade science volume 1 industry PPT template

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