Calculating Internal Energy?

Answer

Internal energy is the amount of energy that is contained in a thermodynamic system. Calculating internal energy is extremely complex and generally unnecessary. In engineering or in thermodynamics, it is very rarely necessary, or close to impossible to take in consideration all of the energy that belongs in one system. Therefore, most scientists use a convenient null reference point for the internal energy. The internal energy depends on the size of the system, and the amount of substance that it contains.
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