Which factor in hair analysis assesses the hair's ability to absorb moisture?

The factor in hair analysis that assesses the hair's ability to absorb moisture is porosity. Porosity refers to the condition of the hair cuticle and how open or closed it is. High porosity indicates that the hair cuticle is more open, allowing moisture to easily enter and exit the hair shaft. This can be a result of damage, excessive processing, or natural texture. Conversely, low porosity hair has a tightly sealed cuticle, making it more difficult for moisture to penetrate.

Understanding porosity is essential for hair care, as it helps determine the right treatments, products, and methods to enhance moisture retention. This is particularly important for maintaining the health and appearance of hair, as various hair types require different levels of moisture and care based on their porosity.