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Thermal radiation is radiation that can be seen as either heat or light. It is a form of heat transfer that is moved from one place to another by electromagnetic radiation. It does not require a form of matter to be transferred.
- Robert Siegel, Thermal Radiation Heat Transfer, Fourth Edition (London; New York: Taylor & Francis, 2002), p. 1
- Mahesh M. Rathore; Raul Raymond Kapuno, Engineering Heat Transfer (Sudbury, MA: Jones & Bartlett Learning, 2011), p. 807