Water cooling is a metho of heat removal from components. As opposed to air cooling, water is used as the heat transmitter. Water cooling is commonly used for cooling internal combustion engines in automobiles and electrical generators. Other uses include cooling the lubricant oil of pumps; for cooling purposes in heat exchangers; cooling products from tanks or columns, and recently, cooling of various major components inside top-end personal computers. The main mechanism for water cooling is convective heat transfer.