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An engineer adds up the mechanical energies of every molecule in a gas. That total is the system's:
AInternal energy
BInterval energy
CInterior pressure
DInertial energy
Answer & Solution
Correct answer: A. Internal energy
1. Each molecule carries kinetic and potential energy of its own.
2. Summing them across the whole system gives one quantity.
3. That total is the internal energy.
_Source: OpenStax University Physics Volume 2, Chapter 3, The First Law of Thermodynamics._
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