What determines porosity?

What determines porosity?

• A. The length of the hair
• B. The hair's ability to absorb and hold moisture or chemicals
• C. The color of the hair
• D. The root depth

Answer: (B)

Porosity is about how well hair can absorb and hold moisture and chemical treatments. This depends on the condition and openness of the cuticle layers: when the cuticle scales are lifted or damaged, moisture and chemicals pass in and out more easily, which describes high porosity; when the cuticle is smooth and compact, absorption is slower, which describes low porosity. So the hair’s ability to take in and retain moisture or chemicals determines porosity. The other options don’t fit because hair length, color, and root depth don’t reveal how open or closed the cuticle is, which is what controls porosity.

Porosity is about how well hair can absorb and hold moisture and chemical treatments. This depends on the condition and openness of the cuticle layers: when the cuticle scales are lifted or damaged, moisture and chemicals pass in and out more easily, which describes high porosity; when the cuticle is smooth and compact, absorption is slower, which describes low porosity. So the hair’s ability to take in and retain moisture or chemicals determines porosity. The other options don’t fit because hair length, color, and root depth don’t reveal how open or closed the cuticle is, which is what controls porosity.