===========+===========+===========+===========+===========+=========== Proportion| |Proportion |Proportion | |Proportion of alcohol|Temperature|of alcohol |of alcohol |Temperature|of alcohol in the | of the |in the | in the | of the | in the boiling | boiling |condensed | boiling | boiling |condensed liquid in | liquid. |vapor in | liquid in | liquid. | vapor in 100 vols. | |100 vols. | 100 vols. | | 100 vols. -----------+-----------+-----------+-----------+-----------+----------- 92 | 171.0 F. | 93 | 20 | 189.5 F. | 71 90 | 171.5 F. | 92 | 18 | 191.6 F. | 68 85 | 172.0 F. | 91.5 | 15 | 194.0 F. | 66 80 | 172.7 F. | 90.5 | 12 | 196.1 F. | 61 75 | 173.6 F. | 90 | 10 | 198.5 F. | 55 70 | 175.0 F. | 89 | 7 | 200.6 F. | 50 65 | 176.0 F. | 87 | 5 | 203.0 F. | 42 50 | 178.1 F. | 85 | 3 | 205.1 F. | 36 40 | 180.5 F. | 82 | 2 | 207.5 F. | 28 35 | 182.6 F. | 80 | 1 | 209.9 F. | 13 30 | 185.0 F. | 78 | 0 | 212.0 F. | 0 25 | 187.1 F. | 76 | | | ===========+===========+===========+===========+===========+=========== Pure, absolute alcohol is a colorless, mobile, very volatile liquid, having a hot, burning taste, and a pungent and somewhat agreeable odor. It is very inflammable, burning in the air with a bluish-yellow flame, evolving much heat, leaving no residue, and forming vapors of carbonic anhydride and water. Its specific gravity at 0∞ C (32∞ F.) is .8095, and at 15.5∞ C. (60∞ F.) .794; that of its vapor is 1.613. It boils at 78.4∞ C. (173∞ F.). The boiling point of its aqueous mixtures are raised in proportion to the quantity of water present. Mixtures of alcohol and water when boiled give off at first a vapor rich in alcohol, and containing but little aqueous vapor; if the ebullition be continued a point is ultimately reached when all the alcohol has been driven off and nothing but pure water remains. Thus, by repeated distillations alcohol may be obtained from its mixtures with water in an almost anhydrous state.