"Do They Absorb Water" Materials Around Us PPT Courseware 2

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"Do They Absorb Water" Materials Around Us PPT Courseware 2

cognitive introduction

Think: Some materials allow water to soak easily, while others do not. What is the water absorption capacity of the four materials: wood, paper, metal and plastic?

scientific inquiry

Choose a piece of wood, a piece of paper, a piece of metal, and a piece of plastic, place them flat on the table, and use a dropper to drop a drop of water on each. as the picture shows:

hint:

1. Try to keep the size of the drop of water the same.

2. Observe the changes of water droplets from the side, and also pay attention to the changes of the part of the material that encounters water.

3. Pay attention to recording. You can use pictures and words to describe the observed phenomena. Such as the water absorption speed of the material, the size of the wetted surface of the material, the shape of the water droplets on the material, etc.

4. Based on the observed phenomena, rank the four materials from strong to weak in terms of water absorption, and then think about: What may be related to the water absorption of the materials? After the experiment, organize the equipment.

Knowledge explanation

The raw materials used by Cai Lun to make paper: rags, old fishing nets, hemp heads and bark.

The raw materials for modern industrial papermaking: plant stems, leaves or recycled waste paper.

What raw materials can we use to make paper in class?

What have you gained from studying?

After class practice

1. Continue to collect relevant materials and see what their water absorbency is? Communicate with classmates after class.

2. Give full play to your intelligence and use the knowledge you learned today to create a beautiful paper bookmark for your good friend.

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"Do they absorb water" Materials around us PPT:

"Do They Absorb Water?" Materials Around Us PPT Part One Content: Who is more likely to absorb water? Some materials are easy for water to soak through, while others are not. What are the water absorption capabilities of the four materials: wood, paper, metal and plastic? Choose a wood chip, a piece of paper,...

"Do They Absorb Water" Materials Around Us PPT Courseware 4:

"Do They Absorb Water" Materials Around Us PPT Courseware 4 Who is more likely to absorb water? Guess: Who is more likely to absorb water? How to verify whether your guess is correct? Small requirements for the experiment: ①Fairness of the experiment: the size and thickness of the material...

"Do They Absorb Water" Materials Around Us PPT Courseware 3:

"Do They Absorb Water" Materials Around Us PPT Courseware 3 Small Experimental Requirements: ①The water droplets are the same size. ②Observe the changes of water droplets from the side, and also pay attention to the changes of materials when exposed to water. ③Note and describe the observed phenomena. Such as material water absorption speed, material infiltration...

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Update Time: 2024-11-24

This template belongs to science courseware Third Grade Science Volume 1, Textbook Edition industry PPT template

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