. The Pharmaceutical era. e chimney. In other words, we have in thechimney an atmosphere of illuminating gas in whichburns the air, drawn into the chimney by the draft gen-erated by the burning flame above. Slow Combustien.—This term is used to designate proc-esses of oxidation taking place so slowly that the heatgenerated is not sufficient to produce the sensation oflight. For instance, a piece of iron, after having beenheated to a red teat, will burn energetically in oxygengas. Also a piece of iron left exposed to the air will, inthe course of time, combine with oxygen, forming thewell-known
. The Pharmaceutical era. e chimney. In other words, we have in thechimney an atmosphere of illuminating gas in whichburns the air, drawn into the chimney by the draft gen-erated by the burning flame above. Slow Combustien.—This term is used to designate proc-esses of oxidation taking place so slowly that the heatgenerated is not sufficient to produce the sensation oflight. For instance, a piece of iron, after having beenheated to a red teat, will burn energetically in oxygengas. Also a piece of iron left exposed to the air will, inthe course of time, combine with oxygen, forming thewell-known iron rust, which is an oxid of iron. In bothcases the iron is oxidized, and in both cases the same to-tal quantity of heat is generated during oxidation ofequal weights of iron. Yet, while in the first case thisheat causes the iron to become intensely luminous, in thesecond case it is generated so slowly that it becomespractically unnoticeable, and no light is have similar instances in the burning of organic. matters. A piece of wood may be burned in a few min-utes, evolving much heat and light during the process;the same piece of wood might be left exposed to the airand in the course of months or years it would disap-pear, in consequence of a slow oxidation or slow com-bustion taking place. The elements forming woody fiber,which is the principal constituent of wood, are carbon,hydrogen and oxygen. The final products formed eitherby ordiuai-y or by slow combustion are identical, viz.,carbon dioxid and water. Another process of slow combustion is the one takingplace in the animal system, where the food, after havingundergone various other changes, is gradually burnedup. The carbon and hydrogen contained in the foodare converted into carbon dioxid, and water, the sameproducts which would be formed if we were to burn thefood directly in atmospheric air. The heat of the ani-mal body is due to this slow combustion. Oxidizing Agents.—In many cases, combustion may take
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Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
