Questions about 3rd grade science What are the properties of paper?

1. Cultural and printing paper: newsprint, offset paper, writing paper, coated paper, dictionary paper, stamp paper, ** paper.

2. Packaging paper: kraft paper, kraft cardboard, corrugated base paper, cement bag paper, paper bag paper, whiteboard paper (white paper, gray paper), oil-proof paper, cellophane, aluminum foil, white cardboard, parchment paper, translucent paper.

3. Industrial technical paper: tracing paper, release paper, carbon paper, pressing paper, insulating cardboard, discipline paper, drawing paper, filter paper, photographic base paper

Heat-sensitive paper, thermometric paper, coordinate paper, carbonless copy paper, capacitor paper, wallpaper, impregnated paper, map sea drawing, copy paper, pine paper.

4. Household paper: cigarette paper, toilet paper, sanitary napkins, facial tissues, crepe paper.

5. Special paper: cotton paper, rice paper, separator paper, dust-free paper, grease separator paper, dustproof paper, rust-proof paper, banknote paper, tissue paper, inkjet paper, wiping paper, thermal paper, tracing paper, filter paper, glyph paper, oil blotting paper, tea bag paper, aluminum foil paper, copy paper, art paper, shoji paper, breathable paper, parchment paper, carbon paper, raw edge paper, release paper base paper, carbonless copy paper, wallpaper base paper, glass cardboard, coffee filter paper, peel paper, physiological paper, cigarette card, glassine paper, wallpaper covering, Melamine board paper, hygroscopic paper, flame retardant paper, asbestos paper, asphalt paper, anti-mold paper, static prevention paper, conductive paper, semi-conductive paper, battery separation paper, electromagnetic shielding paper, electrical insulating paper, heat-resistant paper, automotive filter paper, air conditioning filter paper, deodorization filter paper, medical and health paper, medicine package paper, sterile paper, medical adhesive cloth substrate, surgical gown, abrasive paper, silkworm cotton paper, hotbed paper, covered paper, shading paper, seedling paper, insect proof paper, pressure sensitive recording paper, printed circuit board thick paper, heat sensing recording paper, magnetic recording paper, magnetic cardboard, thermal transfer recording paper, Electronic base board paper and other information paper, photo paper, mirror polishing paper, printing paper, paper rope, sulfuric acid paper, calligraphy and painting paper, humidity control paper, ink flow paper, cosmetic paper, enzyme immobilization paper, absorbent paper.

Paper is the great invention of our Chinese nation.

Paper is the product of civilization and the carrier of civilization.

Paper makes us ashamed, maybe we can't make a piece of paper in our lifetime, but we waste a lot.

Paper reminds us to take care of the environment and thank nature for its generosity.

Our life is like a piece of paper, and whether it is wonderful or not depends on what we use and how we paint it.

A lot of things are just a layer of paper, but it's actually very simple; But you don't want to pierce it.

A currency is a piece of paper that depreciates rapidly.

Your graduation certificate is a piece of paper.

Your marriage certificate is a piece of paper.

Your home deed is a piece of paper.

Your driver's license is a piece of paper.

Your passport is a piece of paper.

Yours is a piece of paper.

Your bank passbook is a piece of paper.

The various bills are sheets of paper.

The Dharma born of karma, I say, is paper, also known as pseudonym, and it is also the middle morality.

Paper is not different from empty, empty is not different from paper; Paper is empty, and empty is paper.

The world is a piece of paper, and a piece of paper is the world.

The characteristics of paper are roughly like this, coming to a world, condensed into one word.

The reason for this lesson is that the structure of paper is made of fine fibers, which makes it easy to absorb and penetrate water.

Paper is a great invention of our Chinese nation.

Paper is the product of civilization and the carrier of civilization.

Paper makes us ashamed, maybe we can't make a piece of paper in our lifetime, it's dusty but a lot of waste.

The paper reminds me to take care of the environment and thank nature for its generosity.

Features of pulp:

Pulp is processed from certain plants as raw materials, and it is the basic raw material for papermaking.

The main component of fiber in pulp is cellulose, and there are also different degrees of hemicellulose, lignin, resin, pigment, pectin and ash and other substances.

The water absorption of paper is related to the size and number of pores, and the softer the paper, the more pores there are, the stronger the water absorption.

There are a large number of pores in the paper, and when water comes into contact with the paper, water will fill the pores inside the paper due to surface tension.

The paper of a book has fewer pores, while the papyrus paper is larger and more numerous, so there is a difference in water absorption.

1. The degree of heat and cold of the object is called ( ) To accurately know the degree of heat and cold of the object, we need to use ( Our commonly used thermometer is (

2. Water is composed of many water molecules. The water molecules on the surface of the water are close together and there is a force that attracts each other, which is the water (

3. Wind direction is an instrument for measuring ( ). When the wind vane arrow guides, it is a wind, when the wind vane arrow points east, it is a wind, when the leaves drift north, it is a wind, and when the school's flag is blown northwest, it is a wind.

4. Air is a gas of ( ). There was air all around us. Air occupation (

Second, I will judge (type " and "wrong hit" in the parentheses after the question that you think is correct

1. The tool for measuring the amount of water is a graduated cylinder, and its unit is .

2. Objects of the same volume experience the same buoyancy after being immersed in water. （

3. Air has a certain volume and a certain shape. （

4. The ball with inflatable feet is thrown higher than the ball without inflatable feet. （

3. I will choose (fill in the number of the correct answer in parentheses after the question).

1. The following method that is easy to blow out the candle is ( ).

a. Blow through the beer bottle b. Blow through the stationery box c. Blow through the funnel.

2. The following objects float in the water ( ).

A, Pencil sharpener B, Eraser C, Pencil.

3. A coin can float on the water, mainly because of ( ).

a. Buoyancy of water b. Surface tension of water.

4. The gas with the most content in the air is ( ).

a, oxygen b, nitrogen c, carbon dioxide.

Fourth, I can guess and design.

1. Why is it that I put a burning candle in a bottle containing carbon dioxide and the candle goes out? Please write your hypothesis and research plan.

My conjecture: My scheme:

2. Is there air in chalk? Please write your hypothesis and research plan.

My conjecture: My scheme:

5. Science in life.

1. Why is it so easy to lift a person in the water but difficult on land?

2. There is a cup of hot water, you want it to cool down quickly, what can you do?