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Do you mean the number and letters on pencils? If so, H means hard and the higher the number, the harder - 9H is as hard as they come and will produce a very thin line with ease. HB means hard black and it sits in the middle of the scale. B means black and the higher the number the softer - 9H is very soft and used for sketching only. A common grade for everyday use is HB. There is also an American system where a 2 is an everyday grade similar to HB All pencil lead is a mix of graphite and clay.
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Is pencil lead is Pb free?
There is no lead in pencil - Pencil is made from graphite
A diamond and a pencil are made of what element?
A diamond and a pencil lead (graphite) are both made of carbon. The difference is the crystalline structure of the carbon atoms.
What is the formula for pencil lead?
The formula for pencil lead is c3,h2o
What objects can lead be made into?
pencil . The 'lead' in a pencil is actually graphite.
Why is pencil used in chromography?
pencil is use in chromography because the pencil is made from lead
Is it called a lead pen or a lead pencil?
lead pen because a lead pencil is a regular pencil.
Does pencil lead have coal in it?
Pencil lead does not have coal. Pencil lead contains graphite.
Why the term lead pencil incorrect?
lead pencil is incorrect because it lead pencil
What is the percentage of lead in the lead pencil you are using?
there is no lead in lead pencil.
Is pencil lead is Pb free?
There is no lead in pencil - Pencil is made from graphite
Is pencil lead solution?
Pencil lead is a compound
A diamond and a pencil are made of what element?
A diamond and a pencil lead (graphite) are both made of carbon. The difference is the crystalline structure of the carbon atoms.
Which has the most lead aluminum or pencil lead?
Pencil lead isn't really lead, it is graphite, a form of carbon. Pencil lead doesn't have any lead in it whatsoever.
What is the formula for pencil lead?
The formula for pencil lead is c3,h2o
How do they get lead out of pencil?
we get lead of pencil from the mixture of clay and graphite
When was a lead pencil invented?
The lead pencil was invented on 1564.
Is a pencil lead is insulator or conductor?
Pencil lead is a conductor.
