A : Hb H is Hemoglobin H, which is a type of hemoglobin which is normally found in adult human beings. Hemoglobin is the oxygen-carrying chemical compound in our red blood cell.
The hardness depends on the thermal and chemical treatment and is between 200 HB and 375 HB.
All glass will melt given sufficient heat. There are certain heat resistant glass wear used for cooking and in laboratories..
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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.
With pencils H stands for hard, B for black (soft), HB is between the two.
:a = .5(hb+c) :2a = hb+c :2a−c = hb :(2a−c)/h = b
This gives us the equation: A = hb/2 + c To solve for c, we simply subtract hb/2 from each side! A - hb/2 = c c = A - hb/2
hb h
H or hb is used for lettering in ed
HB
The order of hardness goes:9H 8H 7H 6H 5H 4H 3H 2H H F HB B 2B 3B 4B 5B 6B 7B 8B 9B hard medium soft
H stands for Hard B stands for Black Pencils are graded according to hardness of the lead or softness. Example: 3H is very hard 2H is quite hard, but less hard than 3H H is hard HB is middle B is softer than HB B2 is softer still 3B is very soft almost like a charcoal
Spanish, French, German, Chinese
H stands for hardness and B stands for blackness this is how a pencil scale goes: 9H 8H 7H 6H 5H 4H 3H 2H 1H H HB B 1B 2B 3B 4B 5B 6B 7B 8B 9B9H is very fine hard and light but 9B is thick black and very soft (more like charcoal)
HB refers to the hardness of the pencil. In the scale H is used for harder pencils (H for hard) HH HHH HHHH all get progressively harder, and B (the B stands for black) BB BBB BBBB get progressively softer. HB pencils (#2 on the US pencil-hardness scale) are right in the middle, so the HB stands for Hard Black.
If you mean what HB stands for, it's an indicator for the hardness (H) or softness (B) of the graphite and clay used. However, the B is for blackness so HB is like average/medium grade so the full form would be Hard Black, Hard and Black, or Hard Blackness. If you check out pencils like 3H, you'll notice that the tone when writing or drawing is light compared to an HB. Conversely, a 3B pencil will give you a darker tone.