Abstract
The Helmholtz force density ${\stackrel{\ensuremath{\rightarrow}}{\mathrm{f}}}^{(\mathrm{H})}$ for a dielectric fluid placed in an electric field is derived microscopically. It is found that in addition to an electrical force, there is also an additional mechanical force proportional to $\stackrel{\ensuremath{\rightarrow}}{\mathrm{E}}$ and only the sum of the two equals ${\stackrel{\ensuremath{\rightarrow}}{\mathrm{f}}}^{(\mathrm{H})}$. Time-dependent cases are briefly discussed.
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