The tribology term comes from the Greeks of the words ‘’ tribos’’ meaning ‘’ friction ‘’, and ‘’logos’’ meaning ‘’ law ‘’. Therefore Tribology is defi ned as “ a science which studies surfaces moving one compared to the other “ and also a fi eld of science studying lubrication, friction, and wear. This book aims to recapitulate old informations available and brings new informations that are with the fashion research on an atomic and nanometric scale in various fi elds by introducing several mathematical models to measure some parameters characterizing metals like the hydrodynamic elasticity coeffi cient, hardness, lubricant viscosity, viscosity coeffi cient, tensile strength It.
