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For graphite pencils the # is the hardness; the letter represents the darkness. 2 is a soft led, 7 hard. B 'should' be black, HB is generally a steel gray, H a little lighter.
number two has darker graphite. the higher the number the darker it is. Also, number 2 pencil's tips don't break as often.
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Why is there a number and a word on a pencil?
Numbers and letters on the sides of some pencils (Art & Drafting pencils) is used to signify the type of lead that it contains, or more specifically the hardness of that lead. The higher the number/letter combination, the harder the lead. Conversely, the lower the number/letter combination, the softer the lead. The typical pencil (#2 pencil) contains HB Grade lead. PencilPages.com notes (from The Pencil Hardness Test); "The hardest is a 9H, followed by 8H, 7H, 6H, 5H, 4H, 3H, 2H, and H. F is the middle of the hardness scale; then comes HB, B, 2B, 3B, 4B, 5B, 6B, 7B, 8B, and 9B, which is the softest. Another grading method uses numbers; the equivalents would be #1=B, #2=HB, #2-1/2=F, #3=H, and #4=2H." The H represents hardness and the B represents blackness.
What art pencils do you use for a 9 value scale?
ebony pencil, 4B pencil, HBpencil(#2 pencil), 4H pencils
Will pencils become obsolete?
Short answer: No. Long answer: Some forms of pencil will become obsolete, such as the #2 HB that has to be sharpened. People will just switch to #2 HB leads in mechanical pencils.
What is the best type of pencil in the world?
it depends on the use. for taking notes, mechanical pencils are the best, for no sharpening is required. for less demanding work, wood pencils are more efficient because they are cheaper, but require constant sharpening. I will be impressed when they make a number 3 pencil. the higher the number, the thicker the lead is. thicker lead is less concentrated, and therefore it has a lighter mark on paper. this is mainly why artists use thicker lead for sketching.
What kind of pencils are good for sketching animals?
i like to use a good lead pencil number 1 because the lead isn't as hard as a number 2 pencil and therefore is easier to shade with. Good luck with your drawing!
What are the rectangles with an area the same as perimeter?
Given any number b > 2, let l = 2b/(b-2) then the rectangle with sides of l and b will have an area = l*b = 2b/(b-2) * b = 2b2/(b-2) and perimeter = 2*(l+b) = 2*[2b/(b-2) + b] =2*[2b/(b-2) + b(b-2)/(b-2)] = 2/(b-2)* [2b+b2-2b] = 2b2/(b-2) So that the area and perimeter have the same numeric value.
-2b plus 7-3b equals 2?
-2b + 7 -3b = 2 -2b +7 -3b +2b = 2 + 2b 7 -3b + 3b = 2 + 2b +3b 7-2 = 2-2 + 2b + 3b 5 = 5b 1 = b
What is the algebraic expression for the product of 2 and a number?
2b=c
Who invented the number 2 pencils?
Thomas Jefferson
Can I use mechanical pencils for school, or do they have to be number 2's?
Yes, there is no rules written that you can't use mechanical pencils for school. However, it's better to get number 2 HB pencils because it's easier to erase.
Can you subtract an odd number from an odd number to get an even number?
Yes. For example, 7 - 3 = 4. You will always get an even number when adding or subtracting an odd and an odd. Let A & B be two odd numbers, so find out if A - B is even or odd. A = 2a +1 & B = 2b + 1 {little a & b are any integers, multiplying by 2 guarantees that 2a is even, then adding 1 will make it odd} A-B = 2a+1 - (2b+1) = 2a + 1 - 2b - 1 = 2a - 2b = 2(a-b). So (a-b) is some integer, but you multiply by 2, so the answer is even. Add A+B = 2a+1 + 2b+1 = 2a + 2b + 2 = 2(a+b+1), so again we are multiplying 2 by some integer, and get an even number.
What is twice the number b?
In algebra, 2 times b would be written as 2b.
If 8b plus 11-3b equals 2b plus 2 what is b?
8b + 11 - 3b = 2b + 2 5b + 11 = 2b + 2 5b - 2b = 2 - 11 3b = -9 b = -3
What are two whole numbers which difference is 48 and their sum is 72?
Formula:A (First Number) + B (Second Number) = C (Sum) C / 2 + 2B = APlugging the Numbers In:A + B = 72 72/2 + 2B = A 36 + 2B = AProof:60 + 12 = 72 60 - 12 = 48*** 60 & 12 ***
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.
What are the proper factors of 4?
Proper factors do not include one and the number itself. The only one left is 2.
Why is there a number and a word on a pencil?
Numbers and letters on the sides of some pencils (Art & Drafting pencils) is used to signify the type of lead that it contains, or more specifically the hardness of that lead. The higher the number/letter combination, the harder the lead. Conversely, the lower the number/letter combination, the softer the lead. The typical pencil (#2 pencil) contains HB Grade lead. PencilPages.com notes (from The Pencil Hardness Test); "The hardest is a 9H, followed by 8H, 7H, 6H, 5H, 4H, 3H, 2H, and H. F is the middle of the hardness scale; then comes HB, B, 2B, 3B, 4B, 5B, 6B, 7B, 8B, and 9B, which is the softest. Another grading method uses numbers; the equivalents would be #1=B, #2=HB, #2-1/2=F, #3=H, and #4=2H." The H represents hardness and the B represents blackness.
