Why we use enthelpy when we calculate latent heat?

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Enthalpy (h) is preferred over internal energy (u) when discussing latent heat due to the significance of volume changes during phase transitions. These changes result in pressure-volume (pV) work, which is not accounted for by internal energy alone. The concept of enthalpy encompasses both internal energy and the work done by the system, making it more applicable for phase changes. This distinction is crucial for accurately understanding thermodynamic processes involving latent heat. Overall, enthalpy provides a more comprehensive framework for analyzing energy changes during phase transitions.
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Why we use enthalpy(h) instead of internal energy(u) when we consider latent heat?
 
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Because a phase change is generally accompanied by a volume change and therefore involves pV work as well.

[edit] I notive you haven't had the customary

Hello seungwoo, :welcome:

So here it is, albeit belated !
 
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