Perspiration (also called sweating or sometimes transpiration)'s the production of a fluid, consisting primarily of water as well as various dissolved solids (chiefly chlorides), that's excreted by the sweat glands in the skin of mammals. Sweat contains the chemicals or odorants 2-methylphenol (o-cresol) and 4-methylphenol (p-cresol), as well as a small amount of urea. In humans, sweating's primarily a means of thermoregulation, although it's been proposed that components of male sweat can act… (More on Perspiration)