A unit of mass equal to1 /12 the mass of an atom of the most common isotope of carbon (carbon 12), which is assigned a mass of 12 and has a value of 1.660 × 10&spminus;24 grams. A hydrogen atom has a mass of 1 atomic mass unit since its mass is1 /12 the mass of carbon 12.
English chemist and physicist who formulated atomic theory and the law of partial pressures; gave the first description of red-green color blindness (1766-1844)
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