A heat transfer oil is a gas or liquid specifically manufactured to transmit heat from one application to another.
This branch of science and engineering involves the transfer of heat via a liquid or vapour — temperature, flow rate, phase transition, pressure, volume, and density all play an important role.
It can also refer to coolants — fluids that flow through a device to prevent overheating. For example, we use water cooling to prevent car engines from overheating.
Oil can also be referred to as thermal oil, thermal fluid, heat transfer fluid, thermic fluid, therm fluid or thermic oil.