What does viscosity refer to in cosmetic products?

Viscosity in cosmetic products refers specifically to the thickness or resistance to flow of a substance. This is an important property because it affects how the product is applied, its feel on the skin, and how it interacts with other ingredients. For example, a high-viscosity product, like a thick cream or gel, may spread differently on the skin compared to a low-viscosity product, such as a lotion or serum. Understanding viscosity can help professionals select the right formulations for various cosmetic applications, ensuring optimal performance and consumer satisfaction.