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It is called conduction.
That would be a description of heat transfer by conduction.
Matter is needed to transfer thermal energy by conduction and convection. Conduction happens through a substance when there is a difference in thermal energies between regions. Convection is the movement within a fluid caused by hotter material to rise and colder material to sink and transfer heat.
conduction
The definition of thermal conduction is heat transfer. Thermal conduction is when heat is transferred from one source to another.
Convection
Heat travels in 3 ways. Conduction, convection and radiation. Conduction is the transfer of heat through collision of particles. Convection is the transfer of heat through the movements of particles (ie. hot particle rises, cold particle sinks). Vacuum is made up of nothing (when there is no particle, it is vacuum), and so, it is unable to transfer heat through conduction and convection at all, making it the best thermal insulator
Conduction is the transfer of thermal energy through a substance or between substances in contact, by the collision
conduction
conduction
conduction and convection
thermal energy can transfer through conduction, convention and radiation