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In thermodynamics, the internal energy is the quality or state function that characterizes a substance's energy when capillary effects and other external magnetic, electric, and other fields are not present.
The entire energy of a closed system is referred to as internal energy (U) in chemistry and physics. The system's kinetic energy and potential energy together make up the system's internal energy. Internal pressure is a measurement of how a system's internal energy shifts during expansion or contraction at a certain temperature. Pressure, whose SI unit is the pascal, has the same dimensions as it. Ideal gases' internal energy and enthalpy are only dependent on temperature; neither volume nor pressure play a role. Enthalpy is the overall heat content of a system, whereas internal energy is the entire energy contained in a system. The total of internal energy and the result of pressure-volume work is known as enthalpy.
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