If you have a pencil, you must have an eraser, why can an eraser erase pencil handwriting?

If you have a pencil, you must have an eraser, why can an eraser erase the pencil handwriting? This is a phenomenon that belongs to physics, because these two substances react chemically when they touch and rub against each other. It is generally known that erasers can only erase words written on pencils, and words written on ballpoint pens and pens cannot be erased.

So this combination will form a kind of foil and wipe effect, regardless of the color of the pencil, the hardness of the eraser can be divided. And the wipe is relatively clean, so you can achieve the appearance you have. <>

The eraser is made of natural rubber, and the words written on the erase pencil are generally very soft. If you want to try erasing the words with an eraser after writing, you can achieve the perfect result. Generally, the eraser is soft to the touch, and the paper is a fiber synthesis.

Eraser pencil writing is still relatively easy and clean, will not cause a very dirty sense of picture, for young children is very practical, wipe should also pay attention to the strength, can not wipe the paper. <>

When your child is learning to write, don't let your child use too much force, as it is easy to feel tired. Generally, as long as there is unevenness on the paper, there will be traces of pen marks in the handwriting, which means that the writing is very hard, and if you want to get rid of this trouble, the eraser may not be able to solve it. Because there is also some validation on a certain substance, the eraser will only erase the handwriting, not manipulate the traces.

Erasers bring a lot of convenience to daily life, and teachers basically recommend children to use pencils when they enter school. Because their learning style is simpler, they are also prone to writing mistakes. However, I personally recommend that you must develop a good study habit for your child and try not to use an eraser.

And when buying an eraser, you should choose quality, not with fragrance or dark color. There are also a lot of chemical ingredients added to them, which can also bring harm to the child's body.

The eraser produces something (natural rubber or synthetic rubber) that, like a soft surface, wraps the surface graphite powder into the dough and also carries away the fibers from the surface of the paper, along with the graphite that sticks to it.

This is because of the physical principle, the eraser will absorb the refill powder when erasing the pencil words, and the traces left by the pencil will be peeled off from the surface, and the eraser can erase the pencil handwriting.

The eraser can erase it, the principle of pencil words is very simple, first of all, when the eraser erases the pencil words, the eraser ash absorbs the powder of the pen tip, so that the traces left by the pencil are peeled off from the surface of the handwritten object.

Because of the pencil, its refill is graphite, and the eraser can erase the words written on the pencil because it adsorbs graphite. In our youth, or, uh, some special trades, sir, some societies and other trades use erasers and pencils more often. At this point, if you write it wrong, you need to erase**.

Then mainly for the adsorption of graphite. In fact, it is the adsorption action that erases the traces of the um pencil. However, if you use too much force, the effect may not be particularly good, because there are traces after all.

The pencil lead we use is not lead, but graphite. Graphite is black and very soft. It is one of the softest ores in the world.

When we write on paper with a pencil, the pencil lead will drop some small particles due to friction, which will be adsorbed on the paper to form handwriting. Soft graphite and extremely hard diamond are actually made up of carbon, but their hardness varies greatly. The carbon atoms in diamond form a three-dimensional tetrahedral structure.

Like an iron tower, each carbon atom is tightly bound to the four carbon atoms around it, so the existing carbon atoms are tightly connected, so it is difficult to change its shape.

Because the refill is made of graphite, and the paper is made of fiber, the surface is uneven. When people write, graphite dust stays on the fibrous surface of the paper, and it becomes a word. When we rub the handwriting with rubber, the rubber has a stronger friction force.

Therefore, the eraser has stronger friction than paper, which will wipe off a layer of paper, peel the graphite powder from the surface of the paper, make the graphite powder adsorb on the eraser, and then form a large amount of rubber ash, making the paper clean.

When rubber rubs against paper, it produces rubber-like things one after the other. It's like kneading dough. The graphite powder and paper fibers attached to the surface of the paper are wrapped into a rubbery form and removed from the paper so that the pencil marks on the paper disappear.

As a result, the paper, which has been rubbed against the rubber many times, will become thinner and thinner. Rubber erases the text on the pencil, a physical process that removes trace substances from the rubber's contact with the paper. The substance created by the friction of the rubber takes away the graphite and fibers from the paper, making the pencil words disappear.

Because the pencil can write, the main thing is that the pencil contains graphite, and the structural substance of the eraser is relatively special, it can adsorb graphite, and in our visual view, the epithelium can erase the words written by the pencil.

Because the pencil is made of graphite minerals, it is very soft, and the eraser is made of sulfur and other oily substances, so the eraser can erase the pencil words.

Because the pencil writing is generally lead, and the main component of the eraser is iron oxide, and plants have a combination of pumice powder and other substances, but these things can react with lead to a certain extent.

When the eraser rubs against the paper, graphite molecules are generated, and when the graphite molecules are combined with the paper, the pencil font can be erased.

The eraser can erase pencil words because the eraser adsorbs refill powder.

Principle: The main component of the pencil used in life is graphite, when the pencil is used to write, the lead core of the pencil is crossed by the paper, there will be a fine graphite powder attached to the paper, use the eraser to erase the handwriting written with the pencil, and the graphite powder handwriting on the paper will be attached to the rubber or plastic component of the eraser, so that the pencil words can be erased off by the eraser.

First discovery: The ability of an arubber eraser to erase pencil words was first discovered by British scientist Priest. Before that, people used bread to wipe pencils.

Priest's discovery caused a lot of sensation because it brought great convenience to people. However, the earliest erasers were made of natural rubber, and they did not drop crumbs when erasing words, but just glued the end of the pencil to the eraser, and the more they wiped, the dirtier they became.

Later, substances such as sulfur and oil were added to the eraser, which made the eraser easy to peel off, and the scraped pencil end left the eraser with the debris, so that the eraser could always be kept clean and the paper would not stain.

Type of eraser: Hunger Song

1. Rubber eraser.

Brown, pink, and black special drawing erasers for Zheng Yu 2b, 4b, etc., are basically rubber erasers. The texture is soft and opaque when exposed to strong light sources. One of the more common brands on the market is a Korean brand and a Marley brand.

The comfort and erasing effect is good, but the eraser shavings after erasing are relatively long, and the processing is slightly inconvenient.

2. Plastic eraser.

The eraser commonly used in sketching is a plastic eraser, a soft eraser, which can be freely shaped, and is also the most sensitive and soft oak in the eraser family. Not suitable for everyday writing use.

3. Plastic eraser.

This kind of eraser has a strong plastic texture because it contains polypropylene group. When placed under a strong light source, it will appear translucent. When erased, eraser shavings generally do not form strips, but into small segments or close to granular.

Some of the "flower erasers" on the market for children are essentially plastic erasers and are not recommended, especially for answers.

Erasers are able to erase pencil writing for a number of reasons:

1. Erasers and pencils are commonly used tools for work and study, which play a great role in our lives. An eraser is a substance made of rubber material, which is made by mixing it with pumice powder, iron oxide, vegetable oil, and other substances, in which the pumice powder is grinded.

2. Pencil refill is a substance made of graphite, which is the softest of the minerals. The key reason why pencil words can be erased by the eraser is that the graphite on the pencil remains on the paper through friction, and the eraser powder rubbed off when the eraser erasers the words rolls away the graphite together.

3. When you write on paper with a pencil, the graphite on the tip of the pen rubs the surface of the paper, and the graphite powder falls off due to friction and stays on it, and then adheres to the paper due to van der Waals force.

4. The graphite powder on the handwriting is not embedded in the paper, but only attached to it, and the two are not completely inseparable. Therefore, it is entirely possible to erase the handwriting, as long as the appropriate force is applied. The eraser is just one of the tools that can be applied to erase pencil handwriting.

5. Before the invention of the eraser, people first used white bread to erase pencil traces, and there are still some artists with feelings who use bread to erase pencil traces.

6. Edward Naim, an English engineer, is believed to have been the first to invent the eraser. The story goes that in 1770, when he had no bread on hand, he tried to take a piece of rubber to wipe the words, and it was wiped off.