Question

When one end of the iron rod is heated it's other end also become hot soon

Answer 1

hello mate
it's so because iron rod is a very good conductor of heat
hope you got your answer
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Answer 2

when we heat one end of iron rod the particles
on that side starts vibrating and hitting other particles . This leds to the transfer of heat from
end to other end . This process of transferring of heat is known as conduction method .You may understand it from this picture