262 



Common Science 



FIG. 147. Will the volume be doubled when the alcohol and water arc poured 



together? 



Experiment 82. Pour alcohol into a test tube (square- 

 bottomed test tubes are best for this experiment), standing 

 the tube up beside a ruler. When the alcohol is just i inch 

 high in the tube, stop pouring. Put exactly the same amount 

 of water in another test tube of the same size. When you 

 pour them together, how many inches high do you think the 

 mixture will be? Pour the water into the alcohol, shake 

 the mixture a little, and measure to see how high it comes 

 in the test tube. Did you notice the warmth when you 

 shook the tube? 



If you use denatured alcohol, you are likely to have an 

 emulsion as a result of the mixing. The alcohol part of the 



