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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.
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)
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]
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3 Ways a Dermatologist Can Help With Hair Loss. It’s true. Dermatologists are hair specialists — in fact, they’re the best medical professionals to go to for hair help.
Human scalp hair grows on average about one eighth inch per week or one half inch per month. [35] Most clipper guards are numbered in eighths of an inch. The number of the guard denotes the number of weeks of hair growth left on the scalp when a clipper with a certain numbered guard is guided over the head with the guard in contact with the scalp.
Studies of minoxidil for receding hairlines show increased hair thickness and volume for many patients when used as directed.Minoxidil is the active ingredient in Rogaine.
Some of these characteristics in humans' head hair vary by race: people of mostly African ancestry tend to have hair with a diameter of 60–90 μm and a flat cross-section, while people of mostly European or Middle Eastern ancestry tend to have hair with a diameter of 70–100 μm and an oval cross-section, and people of mostly Asian or Native ...