Piezo Technology. Epson (UK) Ltd.

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"45 microns, 2 times smaller than the diameter of a person hair and close come the border of resolution because that the person eye"90µm
Denny R"s Homepage. Denny & Gayle Rossbach. Palmdale, CA."Diameter the a human being hairinches: 0.001; centimeters: 0.00254"25.4µm
Why pick a Water treatment System? Aqua-Fresh drink Water Systems, Inc."Particulate contaminants including asbestos, rust, sediment, dirt, and scale as small as 0.2 microns (1/300th diameter that a human being hair)."60µm
Hair - necessary Facts about Hair. CAQTI Cosmetics, Inc."Flaxen hair is the finest, indigenous 1/1500 to 1/500 that an inch in diameter … and black hair is the coarsest, native 1/450 come 1/140 of an inch."17–50µm(flaxen)56–181µm(black)

Hair can be found all over human body, except for the palms the hands and also at the soles that feet. The purpose of hair is protective: the hair on the body keeps a person warm, nose hairs stop dust and dirt indigenous entering the respiratory tract system, and also eyebrows stop sweat native entering the eyes.

The diameter of a person hair walk not have actually a standard value due to the fact that different human being have different hair structures. Your genetic makeup can reason the broad of her hair to differ from the of various other people. Hair color is also a large factor. Black hair is thicker than is red hair. The weather can also influence the diameter the a hair strand. As the weather it s okay warmer, the diameter of human body hair increases. Period is one more factor. Babies and also young youngsters have finer hair than adults. As a person grows up, their hair i do not care thicker and stronger. An additional factor is that, the closer come the root of the hair, the more thick a strand of hair would be.

In mine research, i have found the diameter of person hair to variety from 17 to 181µm (millionths that a meter).

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Brian Ley -- 1999

SEM picture of the week: only their barber knows for sure. MertKeçeli, JoanneWen, SaraSaad, GlennElert. MidwoodScience (7November2011).60~80µm
Student1: 77µm
Student2: 60µm
Student2: 68µm
Student3: 71µm

Editor"s complement -- 2011