Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11
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When We Heat an Object, It Expands. is Work Done by the Object in this Process? is Heat Given to the Object Equal to the Increase in Its Internal Energy? - Physics

Short Note

When we heat an object, it expands. Is work done by the object in this process? Is heat given to the object equal to the increase in its internal energy?

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When we heat an object, it expands, i.e. its volume increases.

Work done by the system, ΔW = P Δ V

Using the first law of thermodynamics, we get

ΔQ = ΔU + ΔW

Since the volume changes, ΔW has some non-zero positive value. Thus, heat given to the object is not equal to the increase in the internal energy of the system.

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HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 4 Laws of Thermodynamics
Short Answers | Q 12 | Page 60
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