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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

   Oval and other shaped fibers are generally more wavy or curly. The cuticle is the outer covering. Its complex structure slides as the hair swells and is covered with a single molecular layer of lipid that makes the hair repel water. [7] The diameter of human hair varies from 0.017 to 0.18 millimeters (0.00067 to 0.00709 in). [10]

4. Orders of magnitude (length) - Wikipedia

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

   100 μm – average diameter of a strand of human hair [25] 100 μm – thickness of a coat of paint; 100 μm – length of a dust particle; 120 μm – the geometric mean of the Planck length and the diameter of the observable universe: √ 8.8 × 10 26 m × 1.6 × 10 −35 m; 120 μm – diameter of a human ovum

5. Micrometre - Wikipedia

   en.wikipedia.org/wiki/Micrometre

   The micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells and bacteria, [1] and for grading wool by the diameter of the fibres. [3] The width of a single human hair ranges from approximately 20 to 200 μm.

6. 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

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]

8. The Link Between Air Pollution And Increased Type 2 Diabetes Risk

   www.aol.com/between-air-pollution-increased-type...

   PM2.5 stands for particulate matter 2.5 microns or smaller. ... Particulates at level PM10 are those with a diameter of 10 microns or less and are inhalable into the lungs, and can include dust ...

9. Vicuña wool - Wikipedia

   en.wikipedia.org/wiki/Vicuña_wool

   The down hair of the vicuña used for the production of vicuña wool is, with an average hair diameter of 11–13.5 microns, one of the finest animal hairs.Only shahtoosh, the hair of the Tibetan antelope, is finer, with an average diameter of 8–13 microns.