Maine Cosmetologist Practice Exam

Density of hair is defined as the number of hairs on a specific area of the scalp. Option A, elasticity of hair, does not accurately measure the density of hair but instead represents the ability of hair to stretch and return to its original state. Option B, diameter of the hair, while it may contribute to the overall appearance of hair, does not measure the density of hair. Option D, hair's growth pattern, does not accurately measure the number of hairs on the scalp. This leaves option C, hairs per square inch, as the most accurate and commonly used measurement for hair density. It provides a more precise and descriptive measurement of the thickness and fullness of hair.