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On a pressure-volume graph, the work done by a slowly expanding gas is read off as the:
AArea under the curve
BSlope of the curve
CHeight of the curve
DLength of the axis
Answer & Solution
Correct answer: A. Area under the curve
1. Work is pressure multiplied by change in volume.
2. Summing those slices along the path is an integral.
3. Graphically that integral is the area under the pV curve.
_Source: OpenStax University Physics Volume 2, Chapter 3, The First Law of Thermodynamics._
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