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How long is a mechanical pencil eraser in inches?
A mechanical pencil or propelling pencil is a pencil with a replaceable and mechanically extendable pencil lead.The eraser is fitted on top of the pencil at the opposite end to the lead.The maximum length of the eraser would be no more than half an inch when new.
How many atoms are i a pencil eraser?
The number of atoms in a pencil eraser can vary depending on its size and material, but a typical rubber eraser weighs about 2 grams. Given that the average mass of an atom is approximately 10^-23 grams, there are roughly 10^24 atoms in a standard pencil eraser. This is an estimate, as the exact number would depend on the specific composition and structure of the eraser material.
How many millimeters is a pencil eraser?
A rubber is about 2.5cm. It depends on how long or short your rubber is.
Why can't the eraser of a pencil just be connected to the pencil instead of the aluminum?
if the aluminum was gone and it was held together by glue than the eraser would simply fall off when you would try to erase.
Who invented the eraser pencil?
Lipman... He actually invented the pencil eraser on top of the pencil because people kept making mistakes. How hard it would without making any mistakes.
What steps would you take to determine the density of a rubber eraser?
To determine the density of a rubber eraser, you would first measure the mass of the eraser using a scale. Next, measure the volume of the eraser by submerging it in a graduated cylinder filled with water and recording the water displacement. Finally, divide the mass of the eraser by its volume to calculate the density.
Can you use a pencil eraser to test for pure silver?
Silver products can be cleaned with a pencil eraser. Thus, to test a product whether it is made from pure silver, just use a soft eraser. If the item is made from silver, after using the eraser the item should be fine and no extra steps are necessary to clean it.
Which came first - rubber or the eraser?
Rubber would have come first as an eraser is made out of rubber. People used pieces of bread to erase mistakes long before they figured out that a piece of rubber would do the trick. Ancient Greeks and Romans had been using flat pieces of lead to draw on papyrus. By the 1400s, graphite had been discovered and, around a century later, the modern pencil began to take shape. Though the milky liquid that was produced by trees in tropical areas had been discovered centuries ago, it was only in the eighteenth century, that the substance "caoutchouc," which was used to create natural rubber, made its way to Europe. Sometime around 1750, it was suggested that the substance be used as an eraser. It was the scientist Joseph Priestley who proposed that the name of the substance be changed to "rubber," because it was used to rub pencil marks away.
How does a eraser erase?
An eraser removes pencil marks by creating friction between the eraser material and the paper. This friction generates heat, which helps to break down and lift the graphite particles from the paper surface, effectively "erasing" the pencil marks.
What would last longer a pencil drawing a line or a rubber rubbing out the line?
In most cases, the rubber. Especially if you don't plan on continually sharpening the pencil.
How do you remove pensil lead foom tiles?
Use a rubber eraser, like you would on paper.
On this day in 1858 the patent for a pencil with an attached eraser was issued Taking your pencils point of view what do you think a typical day in your classroom would be like?
The day was probably spent in instruction and trial of sharpening the pencil with a knife and testing the eraser in correction and writing on your slate with chalk or a slate pencil. There probably not a lot of paper to write or print on!
