The standard free energy change of formation for a compound, then, is just the difference between its standard free energy and that baseline.

那么，化合物的标准自由能形成变化就是其标准自由能与基线之间的差异。

So scientists created a baseline by setting the standard free energy change of formation for an element in its most stable form at standard state to zero.

因此，科学家通过将标准状态下最稳定形式的元素的标准自由能形成变化设置为零来创建基线。