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Heat can also be produced by the impact of imperfectly elastic bodies as well as by friction. This is the case, for instance, when we produce fire by striking flint against steel, or when an iron bar is worked for some time by powerful blows of the hammer.

Hermann von Helmholtz


Author Profession: Physicist
Nationality: German
Born: August 31, 1821
Died: September 8, 1894


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