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The hair scalp counts between 100 000 and 150 000 hair. Made up of 95% of keratin, its resistance to traction is from 50 to 100 milli-newtons per hair, the equivalent of 5 to 10 grams. In average, a hair can absorb 30% of its volum weight in water and stretch out of 10%. Learn more about hair by clicking on one of these related topics below.