Which mode of heat transfer can occur in a vacuum?

Prepare for the Auxiliary Officer and Electrical Division Section 1 Common Core Test with targeted questions and detailed explanations. Enhance your knowledge and improve your skills for the exam!

Multiple Choice

Which mode of heat transfer can occur in a vacuum?

Explanation:
Heat can travel through a vacuum only by radiation. Radiation transfers energy through electromagnetic waves and doesn’t need any matter to carry it, so a hot object can warm another object in empty space (like the Sun warming Earth). In a vacuum there are no molecules to collide and transfer energy by conduction or to move as a fluid for convection, so those modes can’t occur. Evaporation is a phase-change process that can accompany heating, but it isn’t itself a heat-transfer mechanism.

Heat can travel through a vacuum only by radiation. Radiation transfers energy through electromagnetic waves and doesn’t need any matter to carry it, so a hot object can warm another object in empty space (like the Sun warming Earth). In a vacuum there are no molecules to collide and transfer energy by conduction or to move as a fluid for convection, so those modes can’t occur. Evaporation is a phase-change process that can accompany heating, but it isn’t itself a heat-transfer mechanism.

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