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Harold Urey [1893-1981] American
Rank: 104
Scientist, Chemist


Harold Clayton Urey was an American physical chemist whose pioneering work on isotopes earned him the Nobel Prize in Chemistry in 1934 for the discovery of deuterium.


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In general, exchange reactions for the lighter isotopes have equilibrium constants sufficiently different from unity, so that the ratios of concentrations of the isotopes in two compounds which are in equilibrium differ by a few per cents in nearly all cases.
101
Nature can always be more complicated than we imagine.
102
The discovery of deuterium and the marked differences in the physical and chemical properties of hydrogen and deuterium, together with an efficient method for the separation of these isotopes, have opened an interesting field of research in several of the major branches of science.
103
The space program is not only scientific in purpose but also is an expression of man's insistent determination to do the nearly impossible - to explore the unknown, even at great risk.
104

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