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Why is it that no heat flowing through the conductor is absorbed by any cross section when the conductor is in a steady state , there was a question on PSE about the same concept , but the answers provided the reason that it is because heat influx in a time $dt$ , in a given cross section is equal to heat efflux in the same time $dt$ , I would want to know why the heat influx and efflux are the same , that wil answer my question effectively.

link to the referred question In heat conduction, what does it actually mean to be in the steady state?

Qmechanic
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Aditya Prakash
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1 Answers1

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Energy must be conservered, so thermal energy cannot just disapear. If part of the conductor was absorbing a net amount of heat, its temperature would be increasing, which means you are not in a steady state.

By Symmetry
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