<Li> Transformer oil is used for cooling and additional electric insulation of high - power electric transformers . </Li> <P> Waterless coolant is used as an alternative to conventional water and ethylene glycol coolants . With higher boiling points than water (around 370F), the cooling technology resists boil over . The liquid also prevents corrosion . </P> <P> Fuels are frequently used as coolants for engines . A cold fuel flows over some parts of the engine, absorbing its waste heat and being preheated before combustion . Kerosene and other jet fuels frequently serve in this role in aviation engines . </P> <P> Freons were frequently used for immersive cooling of e.g. electronics . </P>

What is the use of coolant in an engine
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