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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.
Width range of human hair [25] 10 −4: 100 μm: 340 μm Size of a pixel on a 17-inch monitor with a resolution of 1024×768 560 μm Thickness of the central area of a human cornea [26] 750 μm Maximum diameter of Thiomargarita namibiensis, the second largest bacterium ever discovered 10 −3: 1 millimeter ~5 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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Hair analysis (alternative medicine) Hair casts; Hair cloning; Hair disease; Hair fetishism; Hair follicle nevus; Hair hang; Hair loss; Hair oil; Hair removal; Hair tattoo; Hair texture powder; Hair theft; Hair washing without commercial shampoo; Hair whorl; Hair's breadth; Hairwork; Head shaving; Human hair growth; Hypertrichosis; Hypotrichosis
Brush cut Marine. A brush cut is a type of haircut in which the hair on the top of the head is cut short in every dimension. [1] The top and the upper portion of the back and sides are cut the same length, generally between 1 ⁄ 4 and 1 ⁄ 2 inch (6 and 13 mm), following the contour of the head.