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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.
What else can I help you with?
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 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
What is the percentage of lead in lead pencil?
Lead pencils actually contain graphite, not lead. The "lead" in a pencil is a mix of graphite and clay.
What element is a diamond and pencil lead made out of?
Both diamonds and pencil lead are made out of the element carbon. The difference lies in their structures: diamonds have a crystal lattice structure, while pencil lead is made up of layers of graphite.
What is the percentage of lead in the lead pencil you are using?
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.
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
Is a pencil poison?
If your asking if the pencil has Lead, then the answer is that most pencils do NOT have lead in them anymore.
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.
How do they get lead out of pencil?
we get lead of pencil from the mixture of clay and graphite
Is a pencil lead is insulator or conductor?
Pencil lead is a conductor.
Which is thicker a 7mm or 9mm pencil lead?
A 9mm pencil lead is thicker than a 7mm pencil lead.
What is lead of a pencil?
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.
What do coal pencil lead and diamonds have in common?
Coal, pencil lead, and diamonds are all forms of carbon. The difference lies in how the carbon atoms are structured. In coal, carbon atoms are loosely attached, while in diamonds they are tightly bonded, resulting in the hardness of diamonds. Pencil lead is a mixture of graphite (which is a crystalline form of carbon) and clay.
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.
