By Michael Faraday
A vintage textual content from Michael Faraday with a brand new foreword by means of J. M. Thomas. This crucial learn for all physicists will provide an perception into the brain of 1 of the best scientists of contemporary centuries.
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Extra info for Experimental Researches in Chemistry and Physics
Being exhausted by the air-pump, it was nearly filled with chlorine; and being then placed over olefiant gas, and as much as could enter having passed in, the stopcocks were shut, and the whole left for a short time. When the fluid compound of chlorine and olefiant gas had formed and condensed on the sides of the vessel, it was again placed over olefiant gas, and in consequence of the condensation of a large portion of the gases, a considerable quantity more entered. This was left, as before, to combine with part of the remaining chlorine, to condense, and to form a partial vacuum; which was again filled with olefiant gas, and the process repeated until all the chlorine had united to form the fluid, and the vessel remained full of olefiant gas.
Experimental researches in chemistry and physics 21 If the paper reddened by boracic acid be heated, the yellow of the turmeric is almost restored, and then it takes from acids a weaker red tinge, and from alkalies a more purplish colour than before. Turmeric, thus altered by boracic acid, is readily restored to its original state by washing; altered turmeric paper when put in water for two or three hours resumes its original properties, and acts, as at first, in testing the alkalies. When the altered paper is placed in sunlight a few days, the colour is soon destroyed as with turmeric alone, and then neither acid nor alkali will affect it.
A more unexceptionable experiment made with iron has been already described; and the inferences from it are against the presence of hydrogen in the compound. Some of the substance in vapour was electrized over mercury by having many hundred sparks passed through it. Calomel was formed and carbon deposited. A very minute bubble of gas was produced, but it was much too small to interfere with the conclusions drawn respecting the binary nature of the compound; and was probably caused by air that had adhered to the sides of the tube when the mercury was poured in.