What does COOL stand for?

Coolant

Coolant is cooling agent may be in gasses or liquid form, This prevents the overheating of any engine or machine. Coolant observe the heat and releze it into the environment. Also known as "antifreeze." A mixture of water and ethylene glycol that has both a higher boiling point and a lower freezing point than plain water. A common term given to the numerous cutting fluids or compounds used with cutting tools to increase the tool life and to improve surface finish on the material. The liquid or gas used to transfer heat from the reactor core to the steam generators or directly to the turbines.