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1. Oxford Dictionary

   Helmholtz, Hermann von

   • IPA[ˈhɛlmhɒlts]

   英式

   • ph.
     (1821–94), German physiologist and physicist; full name Hermann Ludwig Ferdinand von Helmholtz. He formulated the principle of the conservation of energy in 1847. Other achievements include his studies in sense perception, hydrodynamics, and non-Euclidean geometry.