In mechanics, virial stress is a measure of stress on an atomic scale for homogeneous systems. The name is derived from Latin vis 'force': "Virial is then derived from Latin as well, stemming from the word virias (plural of vis) meaning forces." The expression of the (local) virial stress can be derived as the functional derivative of the free energy of a molecular system with respect to the deformation tensor.
In mechanics, virial stress is a measure of stress on an atomic scale for homogeneous systems. The name is derived from Latin vis 'force': "Virial is then derived from Latin as well, stemming from the word virias (plural of vis) meaning forces." The expression of the (local) virial stress can be derived as the functional derivative of the free energy of a molecular system with respect to the deformation tensor.
Source: Wikipedia "Virial stress" · CC BY-SA 4.0
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