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Hofmann Voltameter
A Hofmann voltameter is an apparatus for electrolysing water, invented by August Wilhelm von Hofmann (1818–1892) in 1866. It consists of three joined upright cylinders, usually glass. The inner cylinder is open at the top to allow addition of water which contains a low concentration of a compound such as sulfuric acid to improve conductivity and complete the circuit . A platinum electrode is placed inside the bottom of each of the two side cylinders, connected to the positive and negative terminals of a source of electricity. When current is run through Hofmann's voltameter, gaseous oxygen forms at the anode and gaseous hydrogen at the cathode. Each gas displaces water and collects at the top of the two outer tubes. The tubes which collect the product gases are usually graduated, so that the volume of gas can be measured. Name The name ' voltameter' was coined by Daniell, who shortened Faraday's original name of "volta-electrometer". Hofmann voltameters are no longer used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hofmann Voltameter Fr
Hoffman is a surname of Germany, German and Jews, Jewish origin. The original meaning in medieval times was "steward", i.e. one who manages the property of another. In English language, English and other European languages, including Yiddish and Dutch language, Dutch, the name can also be spelled Hoffmann, Hofmann (surname), Hofmann, Hofman, Huffman (other), Huffman, Hofmans. People with the surname A * Aaron Hoffman (1880–1944), American writer, director and comedian * Abbie Hoffman (1936–1989), American social activist of prominence in the 1960s and 1970s * Abraham Hoffman (1938–2015), Israeli basketball player * Al Hoffman (1902–1960), Russian-born American songwriter * Cloudant, Alan Hoffman (born 1982), American entrepreneur * Albert Hofmann (1906–2008), Swiss chemist and discoverer of LSD * Alex Hoffman-Ellis (born 1989), American football player * Alice Hoffman (born 1952), American author * Anthony Hoffman (1739–1790), New York politician * Arthur Su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
