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Internal energy - Wikipedia
What is Internal Energy? - Definition, Formula, Equation
Internal energy | Definition & Facts | Britannica
6.3: The First Law of Thermodynamics: Internal Energy
8.2: Internal Energy and First Law of Thermodynamics
Internal Energy - HyperPhysics
15.4: Internal Energy - Chemistry LibreTexts
Internal energy. Internal energy of an ideal gas
4.2: Internal energy in a system - Engineering LibreTexts
7.1: The First Law of Thermodynamics, and Internal Energy