_____________________________________________ | | | | | Temperature. | Coefficient of | Solubility. | | | Absorption. | | |______________|________________|_____________| | | | | | Degs. C. | | | | 0 | 1.73 | 0.20 | | 1 | 1.68 | 0.19 | | 2 | 1.63 | 0.19 | | 3 | 1.58 | 0.18 | | 4 | 1.53 | 0.18 | | 5 | 1.49 | 0.17 | | 6 | 1.45 | 0.17 | | 7 | 1.41 | 0.16 | | 8 | 1.37 | 0.16 | | 9 | 1.34 | 0.15 | | 10 | 1.31 | 0.15 | | 11 | 1.27 | 0.15 | | 12 | 1.24 | 0.14 | | 13 | 1.21 | 0.14 | | 14 | 1.18 | 0.14 | | 15 | 1.15 | 0.13 | | 16 | 1.13 | 0.13 | | 17 | 1.10 | 0.13 | | 18 | 1.08 | 0.12 | | 19 | 1.05 | 0.12 | | 20 | 1.03 | 0.12 | | 21 | 1.01 | 0.12 | | 22 | 0.99 | 0.11 | | 23 | 0.97 | 0.11 | | 24 | 0.95 | 0.11 | | 25 | 0.93 | 0.11 | | 26 | 0.91 | 0.10 | | 27 | 0.89 | 0.10 | | 28 | 0.87 | 0.10 | | 29 | 0.85 | 0.10 | | 30 | 0.84 | 0.09 | |______________|________________|_____________| Advantage is taken, as explained in Chapter XI., of the high degree of solubility of acetylene in acetone, to employ a solution of the gas in that liquid when acetylene is wanted in a portable condition. The solubility increases very rapidly with the pressure, so that under a pressure of twelve atmospheres acetone dissolves about 300 times its original volume of the gas, while the solubility also increases greatly with a reduction in the temperature, until at -80° C. acetone takes up 2000 times its volume of acetylene under the ordinary atmospheric pressure. Further details of the valuable qualities of acetone as a solvent of acetylene are given in Chapter XI., but it may here be remarked that the successful utilisation of the solvent power of acetone depends to a very large extent on the absolute freedom from moisture of both the acetylene and the acetone, so that acetone of 99 per cent. strength is now used as the solvent.