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A cup calorimeter is open to the room, so it works at constant:

APotential
BPigment
CPressure
DPosition
Answer & Solution
Correct answer: C. Pressure
1. The cup is open to the air above it. 2. Atmospheric pressure never changes during the run. 3. So it works at constant pressure. _Source: OpenStax Chemistry 2e, Chapter 5, Thermochemistry._
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