The transfer of thermal energy from one substance to another through which requires no physical medium:
Answer: Radiation
Explanation
The transfer of thermal energy from one substance to another that requires no physical medium is called radiation.
Radiation is the process by which thermal energy (heat) is transferred through electromagnetic waves, such as infrared radiation.
They can occur in a vacuum, such as in the transfer of heat from the Sun to the Earth.
Unlike conduction and convection, which require a physical medium (solids, liquids, or gases),
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