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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 decided to make the natural sciences his profession He was appointed as a demonstrator at the Academy of Turin in1806 and the Professor of Natural Philosophy at the College of Vercelli in 1809 and in 1820 he was appointed the professor of mathematical physics He was a physics professor but he also experimented in chemistry using mathematics to base most of his findings Avogadro is well known for his hypothesis known as Avogadros Law His law states that at a given temperature equal volumes of gas contain the same number of molecules equal to about 60221367 x 10 to the 23rd powerA Mole of a substance is the quantity of the substance that weights the same as its molecular mass One mole of any substance is Equal to Avogadros number Therefore Avogadros law can be stated in terms of moles namely that equal volumes of gases at the same temperature and pressure contain the same number of moles Thanks to Avogadro and his number scientists can measure out equal number of molecules by weighing out an equal number of moles For gases this can be done by using 224 liters at STP1 atmosphere and 223 Kelvin 0 deg Celsius Avogadros number is most reliably determined by X-ray diffraction of crystals For many years people thought the number was equal to about 6022045 x 10 to the 23rd power However in 1986 the number was redefined as about 60221367 x 10 to the 23rd powerAlbert Einsteins third research paper was concerned with the nature of molecules We all know that if we drop a lump of sugar into water it diffuses through the water making it somewhat more sticky Thinking of
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