Wells's principles and applications of chemistry; . n avery limited degree. Tliis may be satisfactorily proved by a number of simple experiments. Ifa small quantity of alcohol be poured on the surface of water and inflamed, itwill continue to burn for some time. (See Fig. 23.) A thermometer, im-mersed at a small depth below the common surfaceof the spirit and the water, will fail to show any in-crease in temperature. Another and more simple experiment proves tliosame fact; as when a blacksmith immerses his red-hot iron in a tank of water, the water which sur-rounds the iron is made boiling hot
Wells's principles and applications of chemistry; . n avery limited degree. Tliis may be satisfactorily proved by a number of simple experiments. Ifa small quantity of alcohol be poured on the surface of water and inflamed, itwill continue to burn for some time. (See Fig. 23.) A thermometer, im-mersed at a small depth below the common surfaceof the spirit and the water, will fail to show any in-crease in temperature. Another and more simple experiment proves tliosame fact; as when a blacksmith immerses his red-hot iron in a tank of water, the water which sur-rounds the iron is made boiling hot, while the waternot immediately ia contact with it remains quite cold. If a tube nearly filled with water is held over aspirit lamp, as in Fig. 24, in such a manner as to di-rect the flame against the upper layers of the water,the water at the top of the tube may be kept boilingfor a considerable time, without occasioning theslightest inconvenience to the person who holds it. 94. Conduction of Gases.—Bodies inthe sraseous, or aeriform condition. are more imperfect Fig. 24. <«^ gaseouSj orconductors of heat than air, especially, is one ofthe worst conductors of heat withwhich we are acquainted. The non-conducting properties of fibrousand porous substances are due almost alto-gether to the air contained in their interstices,or between their fibers. These are so dis-posed as to receive and retain a large quantity of air without permitting it tocirculate. Woolens, furs, eider-down, etc., are well adaptoti for clothing in winter, not
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectchemistry, bookyear18
