What is an example of radiation in heat transfer?

Study for the Massachusetts 3rd Class Engineer Exam. Access flashcards and multiple choice questions with hints and explanations. Prepare for success on your exam!

Radiation is a method of heat transfer that does not require a medium, meaning it can occur through a vacuum. It is the transfer of heat in the form of electromagnetic waves. In the context of the question, heat from flames directly warming boiler tubes is a prime example of radiation in heat transfer.

When flames burn, they emit infrared radiation, which travels in straight lines and can heat objects in its path. In this case, the heat generated by the flames does not need to contact the boiler tubes directly to transfer energy; instead, it radiates outwards and is absorbed by the surfaces of the boiler tubes, increasing their temperature.

The other options illustrate different methods of heat transfer. The transfer of heat from boiling water to a lid involves conduction, where heat moves through direct contact. Warm air rising from a heater is an example of convection, where heat is carried away by the movement of fluid (air in this instance). Similarly, heat coming from a radiator in a room primarily relies on convection and conduction to distribute heat throughout the space, rather than radiation. Thus, the scenario involving flames heating boiler tubes distinctly represents radiation, making it the correct choice.

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