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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. 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)

4. 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 .

5. Microscopic scale - Wikipedia

   en.wikipedia.org/wiki/Microscopic_scale

   A microscopic musical instrument called the Micronium has also been developed through micromechanics, consisting of springs the thickness of human hair being plucked by microscopic comb drives. This is a very minimal movement that produces an audible noise to the human ear, which was not previously done by past attempts with microscopic ...

6. The best shampoos for thinning hair in 2025 - AOL

   www.aol.com/lifestyle/best-shampoo-for-thinning...

   Cost: $40 | Key ingredients: Nanoxidil, caffeine, saw palmetto | How it could help: Promotes hair growth, naturally blocks DHT, and prevents fallout. The Revita Extra Strength Hair Density Shampoo ...

7. Dermatologists Say These Hair Oils Promote Long, Thick ...

   www.aol.com/dermatologists-hair-oils-promote...

   These best hair growth oils recommended by dermatologists can help promote healthier, fuller-looking locks. ... also sells this top-rated hair serum designed to promote hair thickness and reduce ...

8. 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]

9. Micrometre - Wikipedia

   en.wikipedia.org/wiki/Micrometre

   The micrometre (Commonwealth English as used by the International Bureau of Weights and Measures; [1] SI symbol: μm) or micrometer (American English), also commonly known by the non-SI term micron, [2] is a unit of length in the International System of Units (SI) equalling 1 × 10 −6 metre (SI standard prefix "micro-" = 10 −6); that is, one millionth of a metre (or one thousandth of a ...