If the volume of an ideal gas increases while pressure remains constant, this increases the internal energy of the system.
A thermodynamic system's internal energy is the energy that it holds. The internal energy of an isolated system is constant. It is the energy required to prepare the system for its current internal condition or to develop it from scratch. Temperature influences internal energy. Internal energy also rises as the temperature rises.
When the volume of an ideal gas has increased the temperature of the gas also increases and the internal energy is directly related to the variation of temperature then the internal energy of the system increases.
Therefore, If the volume of an ideal gas increases while pressure remains constant, this increases the internal energy of the system.
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