If you mean the erasers that have a soft side and a hard side, it is because the soft side is designed to erase lead or graphite from a pencil and the hard side is for erasing ink.
one erases pencil marks and the other erases pen ink
Plastic erasers, plastic bags, parts of projecting pencils{sometimes}...
Erasers pick up graphite particles, thus removing them from the surface of the paper. Basically, the molecules in erasers are 'stickier' than the paper, so when the eraser is rubbed onto the pencil mark, the graphite sticks to the eraser preferentially over the paper. Some erasers damage the top layer of the paper and remove it as well. Erasers attached to pencils absorb the graphite particles and leave a residue which needs to be brushed away. This type of eraser can remove the surface of the paper. Soft vinyl erasers are softer than the erasers attached to pencils, but are otherwise similar.
Yes, we can erase pencil marks with rubber because erasers are made out of rubber
A good teacher, students that pay attention, and pencils that have really good erasers.
I have two rubbers/erasers.
plastic erasers, art gum erasers, kneaded erasers
8 erasers minus 3 erasers is 5 erasers, which is an integer, not a fraction.
The different kinds of erasers available in the market include vinyl erasers, kneaded erasers, gum erasers, and pencil cap erasers.
erasers can be used in violent manner! so use your erasers wisely.
Yes, erasers are recycable.
They have adorable sushi erasers.
They are mini erasers that are from Japan!
you can get puzzle erasers at walgreens, hallmark, micheals,and you can even google it puzzle erasers are just the same as crazerasers and iwako erasers so where ever you get those look there!:)
Take two erasers a rubber band and a pencil. Then aline the the rubber band with the ends of the pen. Then put our erasers on the ends to hold the band in place.
It is a common misconception that Europeans do not use erasers. Europeans do use erasers, and they are widely available for purchase in Europe. Erasers are used in schools, offices, and homes in Europe just like in other parts of the world.
1. when WERE erasers invented. 2. 1927