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A gas expands and pushes the piston outward. The work done by the gas is counted as:
AZero work
BImagined work
CPositive work
DNegative work
Answer & Solution
Correct answer: C. Positive work
1. Work leaves the system when the gas pushes out.
2. The convention gives expansion the positive sign.
3. Work done by the gas counts as positive work.
_Source: OpenStax University Physics Volume 2, Chapter 3, The First Law of Thermodynamics._
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