<P> The mechanical equivalence principle was first stated in its modern form by the German surgeon Julius Robert von Mayer in 1842 . Mayer reached his conclusion on a voyage to the Dutch East Indies , where he found that his patients ' blood was a deeper red because they were consuming less oxygen , and therefore less energy , to maintain their body temperature in the hotter climate . He discovered that heat and mechanical work were both forms of energy and in 1845 , after improving his knowledge of physics , he published a monograph that stated a quantitative relationship between them . </P>
<P> The mechanical equivalence principle was first stated in its modern form by the German surgeon Julius Robert von Mayer in 1842 . Mayer reached his conclusion on a voyage to the Dutch East Indies , where he found that his patients ' blood was a deeper red because they were consuming less oxygen , and therefore less energy , to maintain their body temperature in the hotter climate . He discovered that heat and mechanical work were both forms of energy and in 1845 , after improving his knowledge of physics , he published a monograph that stated a quantitative relationship between them . </P>
who devised the law of conservation of energy
who devised the law of conservation of energy
Julius Robert von Mayer
Julius Robert von Mayer