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2. Hair's breadth - Wikipedia

   en.wikipedia.org/wiki/Hair's_breadth

   This measurement is not precise because human hair varies in diameter, ranging anywhere from 17 μm to 181 μm [millionths of a metre] [8] One nominal value often chosen is 75 micrometres (0.0030 in), [5] but this – like other measures based upon such highly variable natural objects, including the barleycorn [9] – is subject to a fair degree of imprecision.

3. Hair - Wikipedia

   en.wikipedia.org/wiki/Hair

   The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair. Most common interest in hair is focused on hair growth , hair types, and hair care , but hair is also an important biomaterial primarily composed of protein , notably alpha-keratin .

4. Orders of magnitude (length) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(length)

   181 μm – maximum width of a strand of human hair [25] 100–400 μm – length of Demodex mites living in human hair follicles; 175–200 μm – typical thickness of a solar cell. 200 μm – typical length of Paramecium caudatum, a ciliate protist; 200 μm – nominal width of the smallest commonly available mechanical pencil lead (0.2 mm)

5. Unit of length - Wikipedia

   en.wikipedia.org/wiki/Unit_of_length

   micron μm 1 micrometer: Norwegian/Swedish mil or myriameter: 10,000 meters x unit: xu 0.1 picometer ... Thickness of a human hair (around 80 micrometers) Other

6. 10 Science-Backed Tips for Thicker Hair - AOL

   www.aol.com/lifestyle/10-science-backed-tips...

   After 24 weeks, hair thickness was shown to have increased. We can’t draw definite conclusions since the study was so small, but it could be worth trying. gbh007 / iStock. 4. Eat a Healthy Diet

7. Human hair growth - Wikipedia

   en.wikipedia.org/wiki/Human_hair_growth

   Scalp hair was reported to grow between 0.6 cm and 3.36 cm per month. The growth rate of scalp hair somewhat depends on age (hair tends to grow more slowly with age), sex, and ethnicity. [3] Thicker hair (>60 μm) grows generally faster (11.4 mm per month) than thinner (20–30 μm) hair (7.6 mm per month). [4]