What is the meaning of W = -PΔV?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
This formula represents thermodynamic work in gas processes:
- W = work done by or on the gas
- P = pressure (constant for isobaric processes)
- ΔV = change in volume (V_final - V_initial)
- Negative sign: Convention where work done BY the system is positive
When gas expands (ΔV > 0), work is done by the gas (positive). When compressed (ΔV < 0), work is done on the gas (negative).
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