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The Heat Current is Written as ( δ Q δ T ) - Physics

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Question

The heat current is written as `(ΔQ)/(Δt)`. Why don't we write `(dQ)/dt?`

Solution

The amount of heat crossing through any cross-section of a slab in time `Δt` is called heat current.
It is written as `(ΔQ)/(Δt)` and not `(ΔQ)/(Δt)` as complete derivative . This is because the amount of heat crossing through any cross section is a function of many variables like temperature difference, area of cross-section, etc. So, we cannot write it as a complete derivative with respect to time.

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APPEARS IN

 HC Verma Solution for Concepts of Physics - Vol. 2 (2018 to Current)
Chapter 6: Heat Transfer
Short Answers | Q: 1 | Page no. 96

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Solution The Heat Current is Written as ( δ Q δ T ) Concept: Qualitative Ideas of Blackbody Radiation.
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