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"Do they absorb water" Materials around us PPT
Part One: Who is more likely to absorb water?
Some materials allow water to soak through easily, while others do not. What are the water absorption capabilities of the four materials: wood, paper, metal and plastic?
Choose a piece of wood, a piece of paper, a piece of metal, and a piece of plastic and place them flat on the table. Use a dropper to put a drop of water on each. Observe from the side, use appropriate words to describe the observed phenomenon, and express our opinions.
Which material absorbs water easily? Which material does not absorb water easily? Arrange these four materials in order from weakest to strongest water absorption capacity.
Do they absorb water? PPT, part 2: Observations on paper
Our ancestors first carved characters on animal bones and later recorded them on silk. It was not until the invention of paper that writing and printing became greatly convenient.
What are the characteristics of paper? Let's look at a blank sheet of paper.
Paper is made of fibers, and there are certain gaps between the fibers, so it is absorbent.
Summarize the properties of paper.
Lighter weight;
Strong water absorption;
Poor flexibility and easy to fold;
Good ink absorption ability;
Not easy to conduct electricity
Do they absorb water? PPT, Part 3: Making a piece of paper
During the Eastern Han Dynasty, Cai Lun summarized people's papermaking experience in the past, innovated the papermaking technology, and finally made "Caihou Paper". Cai Lun's papermaking technology was listed as one of the "Four Great Inventions" in ancient China.
The ancient papermaking process.
Cutting grass and logging, cooking, soaking and pulping, pounding and pulping
Paper molding and drying into paper
Do they absorb water? PPT, Part 4: Let’s make a piece of paper
Make a piece of paper by imitating the ancient papermaking method.
1. Tear a small piece of waste paper into pieces, put it in a cup, and soak it in water until it can be crushed.
2. Stir paper scraps and water to make a slurry.
3. Pour the paper pulp onto a flat cotton cloth, and then squeeze it with a towel to absorb the water.
Look at a piece of paper we made. Is it the same as the paper we use? What are the possible reasons?
The thickness of paper, its density, and the way paper fibers are stacked are all different. These differences will cause differences in water absorption and firmness of the paper, which are related to the processing process of the paper.
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"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...
"Do They Absorb Water" Materials Around Us PPT Courseware 2:
"Do They Absorb Water" Materials Around Us PPT Courseware 2 Cognitive Introduction Thinking: Some materials are easily soaked by water, while others are 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...