A lot of articles compare micron-ish thicknesses to that of a human hair, which makes me wonder if NIST has a standard human hair used for calibration.
swans on tea
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A lot of articles compare micron-ish thicknesses to that of a human hair, which makes me wonder if NIST has a standard human hair used for calibration.
Machine shop hierarchy of small adjustment: A tad, a skosh, a black CH, a blonde CH, a red CH, a blue CH. Straight hair has a round cross-section. Wavy hair has an elliptical cross-section. Tightly curled hair has a nearly flat cross-section. Standards must therefore allow for anisotropy (and perms versus OEM benchmarks).
A native hair is some 50-60 microns thick. Conditioners swell that.