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because there is no friction between pencils and glass and glass is harder than the lead in the pencil .and glass surface is smoother than the surface of paper

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12y ago

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Why can't you write on glass with pencil?

Glass is a non-porous surface, meaning it lacks tiny pores or spaces for the pencil lead to adhere to. Pencil lead is made of graphite, a material that requires a rough or porous surface to leave a mark. Since glass is smooth and non-absorbent, the graphite in the pencil cannot transfer onto the surface, resulting in no visible markings. Additionally, the hardness of the glass is much greater than that of the pencil lead, so the lead is not able to leave a visible mark on the glass surface.


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bec


Which last longer colored pencil or regular pencil?

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A Refracted image is like an illusion. Which fools the brain e.g. You see a pencil but the pencil has split in two parts.Demonstration:You will need: Glass, Pen or Pencil and WaterSteps:1. Put the glass on a table,2. Fill the glass to about 3/4 quarters of water,3. Put the Pen or Pencil in the glass of water,4. See what happens to the pencil.See, it seems to have split.


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