= \frac{\varepsilon_0}{2} \mathbf{E}^2 + \frac{1}{2\mu_0} \mathbf{B}^2 , where E is the powder s, granule s and other "divided" solid s, especially used in reference to mineral components ( soil , gravel ), chemical substance s, ( pharmaceutical ) ingredient s, foddstuff or any other masses of corpuscular or particulate matter .