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The hardness of lead is about 2.5 on moh's hardness scale.
hope this helped wanka
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∙ 11y ago
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Why do pencils have numbers?
The numbers indicate the relative hardness of the pencil lead.
Is 0.5 lead the same thing as a number 2 pencil?
Actually, what you are asking is referring to the hardness of the pencil. So both, 0.5mm and 0.7mm are the same hardness as number two pencils. The number of lead, 0.5, is a thinner lead in diameter to the 0.7.
Is 0.7 lead the same as a number two pencil?
No. 0.7 lead is just the dimension (in millimeters) The 0.7 has nothing to do with the hardness (which is what the No. 2 refers to). You can purchase 0.7 leads of various hardness that all will fit in the same mechanical pencil.
What is a number 2 pencil?
The # is reference to the hardness of lead A number 2 pencil is averagely hard aka HB
Is a 7 mm mechanical pencil the same as a number 2 pencil?
The "number 2" designation refers to the "hardness" of the lead. The higher the number, the "harder" The "7mm" designation refers to the "thickness" of the lead. The higher the number, the thicker. They are not the same pencil.
Is a 7 mechanical pencil soft lead?
the .7 has nothing to do with the hardness of the lead. The number is the diameter of the piece of lead.
What is the typical hardness of lead recovered from a pistol range?
the hardness has diminished somewhat. however, I've used such lead for casing pistol bullets for about 40 years and never had any problems....
Why do pencils have numbers?
The numbers indicate the relative hardness of the pencil lead.
Is 0.5 lead the same thing as a number 2 pencil?
Actually, what you are asking is referring to the hardness of the pencil. So both, 0.5mm and 0.7mm are the same hardness as number two pencils. The number of lead, 0.5, is a thinner lead in diameter to the 0.7.
Is lead hard or soft?
According to one of my favorite sources (www.webmineral.com), the hardness of elemental lead is 2.0 to 2.5 on Mohs Hardness Scale.
What does the letter H for on pencil?
H indicates the Hardness of the lead inside a pencil
Is 0.7 lead the same as a number two pencil?
No. 0.7 lead is just the dimension (in millimeters) The 0.7 has nothing to do with the hardness (which is what the No. 2 refers to). You can purchase 0.7 leads of various hardness that all will fit in the same mechanical pencil.
What is the percentage of lead in lead pencil?
The percentage is 0%. "Lead" in this case is a misnomer. Pencil "Lead" is made of graphite (an allotrope of carbon) and different levels of clay to control hardness.
How thick is pencil lead?
Pencil lead is a brittle solid and it is graphite made in different hardness's. The thickness and shape of the actual rod of graphite can vary greatly
What does 2b the pencil stand for?
2B stands for 2Black. It is the softness or hardness of a pencil. If you thought there was only one pencil type, think again. There are a variety of lead pencils, ranging in softness or hardness. ^^
Why is graphite used in making pencil leads?
Lead was used at one time, but lead is poisonous. Children, especially, were poisoned by sucking on their pencils. So graphite was substituted for lead and works very well. Graphite may be superior to lead because it can be made with difference degrees of hardness. I do not know about the relative costs.
In order to least to most dense water mercury gold lead?
For lead slight tank in hardness also. But, if gray deliver case joint or north density for a.
