What does alkaline refer to in terms of pH?

Alkaline refers to substances that have a pH higher than 7. In the context of pH scale, which ranges from 0 to 14, a pH of 7 is considered neutral. Values below 7 indicate acidity, while values above 7 indicate alkalinity. Therefore, alkaline solutions, such as certain soaps or baking soda, can neutralize acids and usually exhibit properties such as a slippery feel and a bitter taste. This characteristic is important in various applications within esthetics, including the formulation of skin care products and assessing skin pH, which plays a vital role in the skin's overall health and appearance. Understanding the concept of alkaline solutions helps estheticians make informed decisions when selecting products for different skin types.