size of the sugar molecules but also a value for Avogadro's number. Avogadro proposed his hypothesis in 1811. At that time there was no data at all on the number of particles in a mole. Measurements were made by Robert Brown in 1827 that gave an approximate value for Avogadro's number by observations of brownian motion. Cannizarro later used Avogadro's hypothesis to develop a set of atomic weights based on 116 of the weight of oxygen. This was a basis for finding much more accurate estimates for Avogadro's number. Reasonable values were made in the late 1800's from sedimentation equilibrium of colloidal particles. Millikan's oil drop experiment in the 1900's gave even more accuracy and was cited in most chemistry text books 50 years ago. Text books in 1958 gave Avogadro's number as 6.02 x10 to the 23rd. The current value is 6.0221367x10 to the 23rd power. Amedeo Avogadro proved to be one of the greatest scientists to ever live. If it had not been for Avogadro and his findings there is no way that Chemistry in general would be where it is today. Avogadro's work was recognized nearly fifty years after he had made his hypothesis. Two years after his death, his colleague showed how they could use Avogadro's number to solve many of the problems in chemistry. Avogadro's work also helped other scientists to solve more problems and develop more theories.Bibliography:Asimov, Isaac, A Short History of Chemistry (1965; repr. 1979); Morselli, Mario, Amadeo Avogadro (1984);-Partington, J. R., A History of Chemistry, vol. 4 (1964)Atomic Masses and Fundamental Constants (1980);Rossini, F. D., Fundamental Measures and Constants for Science and Technology (1974) Type in your essay topic or author and click Search! A vogadro was born on June 9, 1776 in Turin, Italy. He began his career in 1796 by obtaining a doctorate in law and practicing as a lawyer for three years after. In 1800, he began to take private lessons in mathematics and physics and dec...
