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[–] 11907952? ago 

How does the metal convert heat to infrared radiation?

BLACK BODY radiation. Not only metal but all materials emit radiation when they are above 0 Kelvin.

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[–] Melissus ago 

Yes,they can emit when there is a medium to convey the heat dont you understand.Without changing wavelength to ir and without a medium to transfer to you cant get rid of the heat.

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[–] 11909473? ago 

EM and Photon's travel in vacuum!