Water has high specific heat. This means that water needs a large amount of heat to become hot, and it needs to lose a large amount of heat to become cold. In other words, water neither heats up nor cools down quickly. This property makes water as an excellent cooling agent. Water is used as a cooling agent in car engines, factories, nuclear reactors, etc. It absorbs the heat produced in an engine or a machine or some other part of a factory and prevents it from becoming too hot.