1. 电磁能量密度: $\cfrac{1}{2}\sex{\ve_0E^2+\cfrac{1}{\mu_0}B^2}$.
2. 电磁能量流密度向量: ${\bf S}=\cfrac{1}{\mu_0}{\bf E}\times {\bf B}$.
3. 电磁动量密度向量: $\cfrac{1}{c^2}{\bf S}$.
4. 电磁动量流密度张量: $\cfrac{1}{2}\sex{\ve_0E^2+\cfrac{1}{\mu_0}B^2}{\bf I} -\ve_0{\bf E}\otimes {\bf E}-\cfrac{1}{\mu_0}{\bf B}\times {\bf B}$.
