What determines hair density?

What determines hair density?

• A. The diameter of each strand
• B. The porosity
• C. The number of individual hairs per square inch on the scalp
• D. The elasticity

Answer: (C)

Hair density is defined by how many individual hairs exist in a given area of the scalp, usually measured per square inch. That count directly determines how full the hair looks and how much scalp is visible. The diameter of each strand affects how thick or fine the hair feels, but it doesn’t change how many hairs are in that area. Porosity describes how well moisture moves into the hair shaft and is about absorption, not how many hairs are present. Elasticity is about how much the hair can stretch and return to shape, which relates to strength, not density. So the key idea is that density comes from the number of hairs per square inch on the scalp.

Hair density is defined by how many individual hairs exist in a given area of the scalp, usually measured per square inch. That count directly determines how full the hair looks and how much scalp is visible. The diameter of each strand affects how thick or fine the hair feels, but it doesn’t change how many hairs are in that area. Porosity describes how well moisture moves into the hair shaft and is about absorption, not how many hairs are present. Elasticity is about how much the hair can stretch and return to shape, which relates to strength, not density. So the key idea is that density comes from the number of hairs per square inch on the scalp.