ABSTRACT
Tribology is the science of friction and studies the friction properties and characteristics between surfaces. Because the skin is a surface, tribological studies can offer insight into its characteristics and how these characteristics alter with changes in age, health, and hydration [1]. They can also track changes induced by exogenous moisturizers and chemicals [1]. Two tribological parameters that have been studied in human skin include a direct one, the friction coefcient, and an indirect one, the electrical impedance, which are investigated by using noninvasive methods to quantitatively assess the skin surface.
