Washington Cosmetology License Practice Exam

What does the term "porosity" refer to in hair?

1. The thickness of the hair strand

2. The hair's ability to absorb moisture

3. The color of the hair

4. The condition of the hair cuticle

The correct answer is: The hair's ability to absorb moisture

Porosity in hair refers specifically to the hair's ability to absorb moisture. This property is influenced by the condition and structure of the hair cuticle, which is the outermost layer of the hair shaft. When hair has low porosity, the cuticle is tightly packed and moisture has a harder time penetrating. Conversely, hair with high porosity has a more open cuticle layer, making it easier for moisture to be absorbed but also more susceptible to damage and moisture loss. Understanding porosity is crucial for selecting the right hair care products and treatments. For example, individuals with high porosity hair might benefit from moisturizing treatments that help retain moisture, while those with low porosity hair might prefer lighter products that won’t weigh their hair down. This distinction helps ensure the best results from hair care practices. The other options do not pertain to the definition of porosity. Thickness relates to the diameter of the hair strand, color denotes the pigment present in the hair, and the condition of the cuticle influences porosity but is not synonymous with it. Thus, the choice that indicates porosity as the hair's ability to absorb moisture is accurate and reflects a fundamental aspect of hair care knowledge.