| Helmholtz's theorem [`helm´hōlt·sǝz ´thir·ǝm] ELECTRICITY See <<Thévenin's theorem>> FLUID MECHANICS The theorem that in the isentropic flow of a nonviscous fluid which is not subject to body forces, individual vortices always consist of the same fluid particles. MATHEMATICS The theorem determining a general class of vector fields as being everywhere expressible as the sum of an irrotational vector with a divergence-free vector. |