Iowa Cosmetology Practice Exam

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What is the effect of high humidity on hair?

It can cause color fading
It can cause dryness
It can cause frizz and expand the hair shaft
It strengthens the hair structure

The correct answer is: It can cause frizz and expand the hair shaft

High humidity has a significant impact on the hair's texture and overall appearance. When humidity levels rise, the moisture in the air interacts with the hair, which is made up of proteins and moisture-absorbent molecules. This often leads to the hair shaft swelled or expanded, creating an uneven surface. The result is frizz, where the hair appears puffy and unruly as individual strands deviate from one another. This phenomenon is particularly common in textured or curly hair, which is more prone to absorbing moisture from the air. Understanding how high humidity affects the hair can help in choosing the right products and styling methods to achieve a desired look that minimizes frizz, such as using anti-frizz serums or lotions.