What does the pH scale measure?

The pH scale is specifically designed to measure the acidity and alkalinity of a substance. It ranges from 0 to 14, where a pH of 7 is considered neutral. Values below 7 indicate acidic conditions, while values above 7 indicate alkaline (or basic) conditions. This measurement is crucial in many fields, including chemistry, biology, and esthetics, as the pH of a substance, such as skincare products, can significantly influence its effectiveness and compatibility with the skin.

Understanding the pH level helps estheticians choose appropriate products for their clients, ensuring that treatments do not disrupt the natural balance of the skin. The other options—measuring temperature variations, sound waves, or electric current—are unrelated to the pH scale and pertain to entirely different scientific concepts.