Internal Energy Definition

Definition: Internal energy (U) is the total energy of a closed system.

Internal energy is the sum of potential energy of the system and the system's kinetic energy. The change in internal energy (ΔU) of a reaction is equal to the heat gained or lost (enthalpy change) in a reaction when the reaction is run at constant pressure.

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Helmenstine, Anne Marie, Ph.D. "Internal Energy Definition." ThoughtCo, Jun. 12, 2014, thoughtco.com/definition-of-internal-energy-605254. Helmenstine, Anne Marie, Ph.D. (2014, June 12). Internal Energy Definition. Retrieved from https://www.thoughtco.com/definition-of-internal-energy-605254 Helmenstine, Anne Marie, Ph.D. "Internal Energy Definition." ThoughtCo. https://www.thoughtco.com/definition-of-internal-energy-605254 (accessed February 18, 2018).