Enthalpy is a thermodynamic system's internal energy total as well as the volume times pressure ratio.
As stated in the equation: H=U+PV, enthalpy (H) is the result of adding internal energy (U) and the product of pressure and volume (PV). The heat evolved (either emitted or absorbed) during a process that runs at constant pressure is equivalent to the change in enthalpy.
The energy within remains constant. The ideal gas law states that when a gas is compressed while maintaining a constant pressure, the temperature decreases according to the volume. In this instance, more energy than you input heats the system.
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