. Elementary physics and chemistry: second stage. Science. Fig. 5.—When water boils bubbles of vnpour are formed in it; during quiet evaporation vapour only escapes at the surface. evaporating basin, where only a small flame, or no flame at all, is used. The differences between quiet evaporation and boiling can soon be seen if this is done. In the case of the solution being gently evaporated, all the vapour is formed at the surface of the liquid, and the process goes quietly on until no liquid is left in the basin. Indeed, this quiet evaporation is always taking place, to some extent, whenever
. Elementary physics and chemistry: second stage. Science. Fig. 5.—When water boils bubbles of vnpour are formed in it; during quiet evaporation vapour only escapes at the surface. evaporating basin, where only a small flame, or no flame at all, is used. The differences between quiet evaporation and boiling can soon be seen if this is done. In the case of the solution being gently evaporated, all the vapour is formed at the surface of the liquid, and the process goes quietly on until no liquid is left in the basin. Indeed, this quiet evaporation is always taking place, to some extent, whenever a surface of liquid is exposed to the air. Even ice slowly evaporates away. In the case of vigorously boiling water, bubbles of vapour are formed everywhere throughout the mass of the liquid. They can be seen at the bottom and the sides, and they rise from every point to the surface, each as it escapes there making a little noise. The sounds of the bursting bubbles added together make up the " singing" or " rattling" which is heard when water is briskly boiling in a flask or other vessel,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gregory, R. A; Simmons, A. T. London: MacMillan
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1900
