What does the pH scale measure?

The pH scale measures the concentration of hydrogen ions in a solution, which directly influences the acidity or alkalinity of that solution. A lower pH indicates a higher concentration of hydrogen ions, making it more acidic, while a higher pH indicates a lower concentration, making it more alkaline. This measurement is crucial in various fields, including cosmetology, as it helps determine the suitability of products for different hair and scalp types.

Understanding pH is essential in hair and skincare because products with different pH levels can affect the hair's cuticle, overall health, and appearance. For example, hair generally thrives at a slightly acidic pH level around 4.5 to 5.5, which helps to keep the cuticle smooth and healthy. Products that are too alkaline can raise the cuticle, leading to dryness and damage. By knowing that the pH scale measures hydrogen ion concentration, professionals can better choose and formulate products to maintain or restore hair health.