heat, radiation,...
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Thermodynamics is "the science of energy transfer in its relation to the physical properties of substances." Heat always moves from hot to cold. My baked chicken is cooling now. The heat is transferring for the chicken to the cooler air. Another example of thermal energy transfer is the action of the radiator in a car. You really need to read a book on thermodynamics because your question is very broad but in general it is the movement of heat from material to material or radiation of heat into space to arrive somewhere else in eons of time. Sorry, I have both cooking and business at this second...bye
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Thermal means heat, radiation