What does HB mean on a number 2 pencil?
A pencil's location on the HB graphite grading scale depends on the hardness of its graphite core. The hardness of the graphite core is often marked on the pencil — look for a number (such as “2” “2-1/2” or “3”) — and the higher the number, the harder the writing core and the lighter the mark left on the paper.
Apsara brings this Regal Gold HB Pencils, these pencils are perfectly dark for academic use and equally soft for easy writing. This pencil is soft and thus required minimum pressure to write.
- Definition of hemoglobin for Students. : a protein of red blood cells that contains iron and carries oxygen from the lungs to the tissues and carbon dioxide from the tissues to the lungs.
- Hemoglobin is a protein in your red blood cells that carries oxygen to your body's organs and tissues and transports carbon dioxide from your organs and tissues back to your lungs. If a hemoglobin test reveals that your hemoglobin level is lower than normal, it means you have a low red blood cell count (anemia).
- High hemoglobin count occurs less commonly because: Your red blood cell production increases to compensate for chronically low blood oxygen levels due to poor heart or lung function. You have a bone marrow dysfunction that results in increased production of red blood cells.
B on its own is just a little softer than HB. 2B, 3B and 4B are increasingly soft. Further up the range, 9B is the very softest lead available, but so soft and crumbly that it's rarely used. Anything over 4B is probably too soft for most people's day-to-day use.
- A mechanical pencil (US English) or propelling pencil (UK English), also clutch pencil, is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" /ˈl?d/. The lead, often made of graphite, is not bonded to the outer casing, and can be mechanically extended as its point is worn away.
- Drafting pencils can hold much larger leads, like a normal, wood-cased pencil but without the need to sharpen. A mechanical pencil is a pencil that holds leads and pushes them out using a dispenser that is activated at the push of a button. I can suggest you three quality mechanical pencils.
- Both diamond and graphite are made entirely out of carbon, as is the more recently discovered buckminsterfullerene (a discrete soccer-ball-shaped molecule containing carbon 60 atoms). The way the carbon atoms are arranged in space, however, is different for the three materials, making them allotropes of carbon.
Pencils are graded using a continuum from H (hardness) to B (blackness. F (fine) is also used as a midpoint between HB & H. A standard pencil, such as the Ticonderoga wooden pencil shown below, would be graded HB.
- A pencil's location on the HB graphite grading scale depends on the hardness of its graphite core. The hardness of the graphite core is often marked on the pencil — look for a number (such as “2” “2-1/2” or “3”) — and the higher the number, the harder the writing core and the lighter the mark left on the paper.
- Silverpoint (one of several types of metalpoint) is a traditional drawing technique first used by medieval scribes on manuscripts.
- The 4B is a good choice for darker shading. It is soft enough to give a good layer of graphite quickly without going blunt too fast. The 6B pencil is good for very dark areas, but it's very soft and blunts quickly so it's difficult to use for detail.
Updated: 19th September 2018