LIQUID PORES.
It is not easy to imagine liquids as having pores, though this seems to be the case as shown by certain familiar experiments. When a certain amount of powdered sugar is slowly poured into warm water, the water will dissolve the sugar and appear to absob it without increasing its volume. Similarly, when alcohol is poured into water, the resulting volume is less than the sum of the two volumes.
For instance, if fifty parts of water and fifty parts of alcohol be mixed together, they will make only ninety-four parts. Apparently one of the liquids has entered into the “pore” of the other. This experiment, as commonly performed in laboratories consists in putting measured quantities of the two liquids together, but the effect would be far more striking were it possible for students to see one of the liquids actually soaking into the other. This can be done in the following way.
fake two glasses, one filled to the brim with water, and the other with alcohol. In order to show the effect to better advantage, colour the alcohol with red ink. The glasses should not be over full—that is, the surface of the liquid should not bulge above the rim of the glass. When everything is ready, place a sheet of paper over the glass full of alcohol, and with a hand on the paper to keep it down on the rim ol the glass invert the tumbler and the liquid will remain in the glass, owing to the air pressure on the paper. Now place the inverted tumbler over the glass full of water, and carefully draw out the paper. This can be done without spilling a drop of alcohol, and yet as soon as the paper is removed the alcohol will commence to drop. Owing to the fact that it is coloured, it is possible to see the alcohol actually “soaking” into the water, while tiny air bubbles that were formerly contained in the “pores” of the water rise slowly to the top of the tumbler. This will continue for some little time until a considerable air space forms in the top of the tumbler.
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Manawatu Herald, Volume XXXIII, Issue 965, 11 March 1911, Page 4
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361LIQUID PORES. Manawatu Herald, Volume XXXIII, Issue 965, 11 March 1911, Page 4
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