Unsur kimia: Béda antarrépisi

The [[standard state]], or reference state, of an element is defined as its thermodynamically most stable state at 1 bar at a given temperature (typically at 298.15 K). In [[thermochemistry]], an element is defined to have an [[Standard enthalpy change of formation|enthalpy of formation]] of zero in its standard state. For example, the reference state for carbon is graphite, because it is more stable than the other allotropes.

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== Tempo ogé ==

* [[Kimia]]