No. Also, "pencil lead" is not lead; it is almost always graphite (made of carbon)
yes yes it is
the point, I think, is either the amount of different substances in the graphite/lead, or even the type of eraser...
There are a lot of advantages to pencils. They don't dry up like pens, for one. They're also eraseable and allow for shading. Thinking more abstractly, they are a direct reflection of how much work you've done with themβthe shorter the pencil (or the inner lead in a mechanical pencil), the more work you've done. There are disadvantages, too. They are in constant need of maintenence (sharpeners, extra pieces of lead, etc.) and tend to smudge as you run your hands across their markings.
what is a qualitative example of a pencil
Yes they are waterproof.
A typical lead pencil does not actually contain lead. The "lead" in a pencil is made of graphite, which is a crystalline form of carbon. Therefore, there is 0% lead in a lead pencil.
Yes, pencil "lead" is not actually lead metal but graphite, which is a form of carbon. So, pencil lead is Pb (lead) free.
Pencil lead is a compound
Pencil lead isn't really lead, it is graphite, a form of carbon. Pencil lead doesn't have any lead in it whatsoever.
No, a pencil is not poisonous. However, ingesting pencil lead or graphite can lead to an intestinal blockage or irritation.
we get lead of pencil from the mixture of clay and graphite
Pencil lead is a conductor.
A 9mm pencil lead is thicker than a 7mm pencil lead.
Pencil lead is made of graphite and clay. Newer recipes for pencil lead use waxy polymers to bind the graphite to produce a lead that does not snap when the pencil is flexed.
It is called a lead pencil. Despite the name, the "lead" in pencils is actually made of graphite, not lead. Lead pens are typically mechanical pencils that use a lead refill.
Because there is no lead in them any more.