Hair density ranges from thick to thin and is measured per square _____.

Hair density ranges from thick to thin and is measured per square _____.

• A. Centimeter
• B. Inch
• C. Meter
• D. Foot

Answer: (B)

Hair density is about how many individual hairs you have in a given area of the scalp. To express this, you count hairs within a defined square area, which in cosmetology practice is a square inch. So the density is described as hairs per square inch. The other options are units of length, not area, so they wouldn’t properly convey the concept of density. (Metric alternative would be per square centimeter, but per square inch is the standard in this context.)

Hair density is about how many individual hairs you have in a given area of the scalp. To express this, you count hairs within a defined square area, which in cosmetology practice is a square inch. So the density is described as hairs per square inch. The other options are units of length, not area, so they wouldn’t properly convey the concept of density. (Metric alternative would be per square centimeter, but per square inch is the standard in this context.)