Normal dry hair elasticity is approximately what percentage of its length?

Normal dry hair elasticity is approximately what percentage of its length?

• A. 5%
• B. 10%
• C. 20%
• D. 40%

Answer: (C)

Elasticity is hair’s ability to stretch and then return to its original length without breaking. For normal dry hair, that stretch is about one-fifth of its length. So a strand eight centimeters long could extend roughly 1.6 cm before risking damage. Dry hair is stiffer and less pliable than wet hair, which is why it can’t stretch as far. Wet hair, with moisture softening the structure, can handle noticeably more stretch. This matters in chemical services, where knowing how much the hair can elongate helps prevent over-stretching and breakage. The other values don’t fit dry hair: five or ten percent would limit stretch too much, while forty percent is more typical of wet hair.

Elasticity is hair’s ability to stretch and then return to its original length without breaking. For normal dry hair, that stretch is about one-fifth of its length. So a strand eight centimeters long could extend roughly 1.6 cm before risking damage. Dry hair is stiffer and less pliable than wet hair, which is why it can’t stretch as far. Wet hair, with moisture softening the structure, can handle noticeably more stretch. This matters in chemical services, where knowing how much the hair can elongate helps prevent over-stretching and breakage. The other values don’t fit dry hair: five or ten percent would limit stretch too much, while forty percent is more typical of wet hair.