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Thelatent internal energy of a system is theinternal energy a system requires to undergo aphase transition. Its value is specific to the substance or mix of substances in question. The value can also vary with temperature and pressure. Generally speaking the value is different for the type of phase change being accomplished. Examples can include Latent internalenergy of vaporization (liquid to vapor), Latent internalenergy of crystallization (liquid to solid) Latent internal energy of sublimation (solid to vapor). These values are usually expressed in units of energy per mole or per mass such asJ/mol orBTU/lb. Often a negative sign will be used to represent energy being withdrawn from the system, while a positive value represents energy being added to the system.[1]
For every type of latent internal energy there is an opposite. For example, the latent internal energy ofFreezing (liquid to solid) is equal to the negative of the Latent internal energy ofmelting (solid to liquid)
| State |  | |
|---|---|---|
| Low energy | ||
| High energy | ||
| Other states | ||
| Phase transitions | ||
| Quantities | ||
| Concepts | ||
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