224 



Table 1 99 

 VAPOR PRESSURE OF ELEMENTS 



(Over liquid unless otherwise noted) 



Hydrogen 

 °K. mm 



Helium 

 °K. mm 



Neon 

 atm. 



Argon 

 *K. mm 



Krypton 

 °K. mm 



Xenon 

 °K. mm 



20.48 787 

 20.36 760 

 I9.65 6ll 

 18.03 552 



16.49 192 

 I4.IO 59.5 



5.16 16680 

 4.9 1329 

 4.20 758 



3-52 360 

 1.48 4.2 



41.38 17.43 



36.27 7.97 



31.32 2.98 



27.17 1.00 



20.4 12.8 mm 



15.6 2.4 



90.35 1026 

 87.31 746 



83-93 

 77.48 



6943 

 6549 



512 

 201 

 48.0 

 22.0 



210.5 41240 

 201.5 31620 

 170.9 11970 

 112. 7 387 

 88.6 17.4 

 84.2 9 



287.7 441 10 

 255.6 21970 

 244.2 15870 

 231.4 11130 

 2374 13500 

 183.2 2020 



Onnes, 1923 



Onnes, 1015-6 



Onnes, 1917 

 Travers, 1902 



Born, 1922 



Ramsay, Travers, 1901 



Niton 

 °K. mm 



Oxygen 

 'K. mm 



Nitrogen 

 °K. mn 



Chlorine 

 °C atm. 



Bromine 

 °C mm 



Iodine 

 °C mm 



377-5 

 3644 

 321.7 

 290.3 

 262.8 

 212.4 

 202.6 



62 



53 

 26.4 

 13.2 

 6.6 

 1.05 

 .66 



37 9-59 

 57 36.1 

 71 64 



59 162.2 



18 493 



13 760 



47 786.6 



77-33 

 76.65 



74-03 

 72-39 

 70.42 

 67.80 

 6365 



760 

 700 

 500 

 400 

 300 

 200 

 100 



+ 100 



+ 20 



41.7 

 6.62 



o 3.66 



33.6 760 

 50 350 



70 118 

 80 62 



88 37 



+58.75 76o 



51.95 600 



40.45 400 



23.45 200 



8.20 100 



— 7-o 45 



— 12.0 30 



— 16.65 20 



+55 3 

 50 2 



45 1 

 40 1 



35 

 30 



15 

 o 



084 



154 

 498 

 025 

 699 

 469 



131 

 030 



Gray, Ramsay, 

 1909 



Cath, 1908 



Fischer, Alt., 

 1902 



Knietsch, 

 1890 



Ramsay, 

 Young, 1886 



Baxter, Hickey 

 Holmes, 1907 



"K. 



Ozone 



mm 



Arsenic, solid 

 °C atm. 



Bismuth 

 °C atm. 



Cadmium 

 °C mm 



Calcium 

 °C mm 



Caesium 

 °C mm 



I20 

 162 



89.94 

 86.OI 

 83.24 

 81.36 



34 

 760 



.089 

 .042 

 .0152 

 .0068 



500 .076 

 616 1. 00 

 697 4.85 

 790 22.3 



2060 

 i95o 

 1740 

 1420 

 1310 

 1200 



16.5 

 11. 7 



6-3 

 1.0 



•338 



•134 



793 1000 

 75i 371 



571 -52 



350 .279 



262 .013 



982 6 



1028 23 



1049 41 



1085 99 



1 129 287 



1 1 75 76o 



247 

 276 



3i6 



353 

 397 



•30 



1. 00 



3.02 



6.68 



15-9 



670 760 



Spangenburg, 



1926 



Reisenfeld 



Horiba, 

 1923 



Greenwood, 

 1910 



Braune, 

 1920 



Ruff, 



Hartmann, 



1914 



Mears, 

 1913 



Copper 

 °C mm 



Gallium 

 °C mm 



Gold 

 mm 



Lead 

 °C mm 



Lead 

 °C mm 



Magnesium 

 °C mm 



1875 20 

 1980 100 

 2l8o 257 

 231O 760 



926 .0004 

 1009 .003 

 1 125 .023 



1155 

 1985 17 

 2315 130 



2500 400 



.00007 



808 .08 

 996 1.75 

 1178 16.8 



1275 73 



1315 105 



1410 266 



1325 760 



1870 6 atm. 



623 9 



742 20 



986 211 



1080 751 



Greenwood, 

 1911 



Harteck, 

 1927 



Harteck, 

 Ruff 



Wartenberg, 

 1913 



Greenwood, 

 1911 



Ruff, 



Hartmann, 



1924 



Niton 

 °C mm 



— 70.6 .66 



— 60.8 I.05 

 + 17.I 13.2 

 +91.2 52.8 



Potassium 

 °C mm 



406.2 4.6 



469.I l6.2 



528.5 44.8 



759-8 783 



Rubidium 

 °C mm 



91 .OOO06 

 1 1 5 .0004 

 250 .98 



366 5.82 



Silicon 

 °C mm 



1890 IO 



2085 I IO 



2195 2IO 



2442 760 



1038 .Oil 



1368 .82 



1660 103 

 1758 200 



Gray, Ramsay, 

 1909 



Flock, Rodebush, 

 1926 . 



Ruff, Konschak, 

 1926 



Smithsonian Tables 



