Why can pencils write?
When we first started writing, we all used pencils; do you know why pencils can write? It turns out that although the paper we usually use looks very smooth, if you observe it with a magnifying glass, you will find that the surface of the paper is rough and uneven. The lead of a pencil is made of something called graphite. The structure of graphite is very loose, like scales. When we write with a pencil, graphite rubs against the paper, and fine graphite powder will fall off the pen core and penetrate into the gaps of the paper that are invisible to our naked eyes, leaving an imprint on the paper, even if it is wiped by hand. Don't fall off. However, when the roughness of the paper is appropriate, the powder can easily penetrate and the written words will be clear. If the paper is very smooth or extremely rough, the pencil will not be able to leave clear writing. Note: When we make typos, we always look for an eraser to help. Eraser is made of something called rubber, which has great elasticity. When we erase the pencil writing with an eraser, the debris falling from the eraser sticks to the pencil powder, and the writing on the paper disappears.
Why can pencils write?
Because the lead of the pencil is graphite (that is, carbon), and the texture of graphite is very soft, if you rub the lead on the paper, it will leave the toner on the paper, so you can write.
Why pencils can write on paper for 5 minutes
Because the hardness of the graphite in pencils is lower than that of paper and has strong adhesion. You can leave traces on the paper.
Why can pencils write? 5 points
Pencil lead
The raw materials and auxiliary materials of graphite lead core include graphite and clay. Graphite is used as a colorant, and its smoothness and plasticity are used to make lead cores that can draw black marks, adhere firmly to the paper, and can be erased with an eraser. Graphite with high carbon content and fine particles should be used. Clay is used as a binder to bind graphite particles together using its plasticity and adhesiveness. Clay with plasticity, low iron content and wide sintering range is required. Auxiliary materials include molding materials and materials that change the performance of the lead core. Molding materials are used to improve plasticity and adhesion, and improve lead core molding efficiency. Commonly used ones include maltose, gum tragacanth, etc. Materials that change lead core performance are used for oil immersion treatment after lead core sintering to improve the physical performance of the lead core (such as wear, concentration, core tip force, slipperiness, hardness, etc.). Commonly used ones include paraffin, beef and mutton fat, petroleum jelly, etc., usually two or more are used in combination. The raw materials of color lead core include coloring materials, physical materials, adhesives, grease and wax. Colorants (including pigments and dyes) play a coloring role and require good tinting power, high hiding power, soft texture, high fineness, good heat resistance, non-toxicity, etc. Commonly used ones include titanium dioxide, carbon black, phthalocyanine blue, etc. Constitution raw materials play the role of bonding, skeleton and adjusting hardness.
Besides writing, what else can a pencil do?
1. Write
2. You can bite and play when you are bored
3. Can be used as chopsticks
4. MM can prevent The pervert stabbed his vulnerable parts
5. You can draw cartoons
6. When you stand it up, you can use it as a level meter
7. You can hang clothes when it goes through the wall
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8. Can be used as a screwdriver to screw in concave hexagonal screws
9. Can be used as fuel
10. Can be used to protect against radiation because it contains lead
< p> 11. You can put it in your hand to turn names and pens12. You can save pens and pencils of course
13. Because of the insulation, you can use it to touch the switch
p>14. Can be tied up and tied into a loop
15. Pencils can be used for copying and wiping
16. The core of the pencil can be ground into powder for lubrication 17. The person who invented the first invention can apply for a patent
18. The wood chips can be made into decorative paintings
19. There is also an eyeliner
20. You can also make marks
21. Carbon pencils can be used as positive and negative electrodes
22. There is a water-soluble pencil that can be used as a dye
23 .You can invent the pencil sharpener
24. You can unite a bundle of pencils so that they are not easily broken
25. You can draw mechanical diagrams
26. You can paint a white sheet black
27. When little BYBY cries, you can put it in a box and rock it to soothe it
28. You can take out the core and blow bubbles
29. The pen core has a lubricating effect, such as a lock
30. It can be used as a nail to drill holes
31. You can use a pencil to help with things that are out of reach
32. You can vent when you are angry
33. You can pick your teeth with the sharp points if they are broken
34. You can commit suicide. Eating too much pen refill can cause poisoning
35. It can be stuck in the keyboard to fix a key
36. It can be used by children to learn addition and subtraction and check them one by one
37. The sole of the shoe is stuck The stones can be pulled out with a pencil
38. You can connect two not too heavy things together
39. With one end sharpened, you can practice darts against the foam
40. When quitting smoking, you can hold a pencil in your mouth and smoke it like a cigarette
41. You can use the tip of the pencil to divide the transparent tape into two sections to use as scissors
42 .Can demonstrate how the huge stones of the Great Wall were transported up
43. Can be used as a pole under the bamboo dragonfly game
44. Can be used as a bookmark to see which folder is inside
45. Two pencils can be used as compasses with one end fixed
46. They can be used as a roulette wheel and you can turn it around a few times and point to whoever is the toughest one
47 blocks and 48 blocks. The ruler is used to draw horizontal lines
49. When in danger in the wild, you can take out the pen core and use it as a straw to drink spring water from the rock crevices
50. Carve and hollow out the pen body to make handicrafts
51 You can cook potatoes by burning several pencils together
52 Cut the pencil into sections, remove the lead and tie it with a rope to make wind chimes, door curtains, etc.
p>Why do some people especially like to write with pencils?
I like to use pencils, both mechanical pencils and wooden pencils. Not all because I am afraid of making mistakes, but just because I hate it. I use a water pen (because the ink always breaks, and the writing is either very floating or very rigid). I used to use a fountain pen, but now I can’t buy good fountain pens, so I used a pencil. Gradually I found that I like it. When writing with a pencil, I usually use 2B, because it is non-reflective and does not become thick easily, and the pencil is not easy to hook or smear if you use a lot of force (the water pen can easily hook and smear if you use a little less force). ).
Why do my hands feel weak when I write with a pencil? 10 points
It’s probably because I held the pen too hard, maybe because I was afraid that the paint wouldn’t be dark enough, I was afraid of crossing the line or not covering enough range, and I was nervous and used too much force.
I think there is no problem if you want to write with a pencil.
Why does pencil writing look so good?
Perhaps the strength of a pencil can be determined, and the pencil lead will be ground into a flat surface after writing. A slight turn will create a sharp corner, and the thickness can be adjusted. . . . . . I also like pencils for these. . . . And I personally prefer gray
Why can’t astronauts write with pencils?
To put it simply, we don’t use pencils anymore
Can primary school students use 2b pencils for writing
As far as I know, there is no formal The rules state what kind of pencils primary school students cannot or can only use. If there are any, it is the school or teacher's regulations.
There is nothing wrong with using a 2B pencil. However, 2B pencils are thicker and softer, so they may break easily when used by children, and the strokes may be unclear because of the thick lead. Therefore, when children are learning to write, HB pencils are more suitable, with moderate softness, hardness, and thickness.