200 



Tables 216-218. 

 TABLE 216. — Effect of Pressure on Melting Point. 



Substance. 



Hg 

 K. 



Na 

 Bi. 

 Sn, 

 Bi. 

 Cd 

 Pb 



Melting point 

 at I kg/sq. cm 



-38 

 59 

 97 

 271 

 231 

 270 

 320 

 327 



Highest 



experimental 



pressure: 



kg/sq. cm 



12,000 

 2,800 

 12,000 

 12,000 

 2,000 

 2,000 

 2,000 

 2,000 



dt/dp 

 at I kg/sq. cm. 



O . 005 I I 



0.0136 



0.00860 



-0.00342 

 0.00317 



-0.00344 

 o . 00609 



0.00777 



A/ (observed) 



for 

 1000 kg/sq. cm 



5 

 13 



+ 12 



-3 

 3 



-3 

 6 



7 



Reference 



* A t (observed) for 10,000 kg/sq. cm is 50.8°. 



fNa melts at 177.5° at 12,000 kg/cm^; K at 179.6°; Bi at 218.3°; Pb at 644°. Luckey 

 obtains melting point for tungsten as follows: i atme, 3623° K; 8, 3594; 18, 3572; 28, 3564. 

 Phys. Rev. 191 7. 



References: (i) P. W. Bridgman, Proc. Am. Acad. 47, pp. 391-96, 416-19, 191 1; (2) G. 

 Tammann, Kristallisieren und Schmelzen, Leipzig, 1903, pp. 98-99; (3) J. Johnston and 

 L. H. Adams, Am. J. Sci. 31, p. 516, 1911; (4) P. W. Bridgman, Phys. Rev. 6, i, 1915. 



A large number of organic substances, selected on account of their low melting points, have 

 also been investigated: by Tammann, loc. cit.; G. A. Hulett, Z. physik. Chem. 28, p. 629, 1899; 

 r. Korber, ibid., 82, p. 45, 1913; E. A. Block, ibid., 82, p. 403, 1913; Bridgman, Phys. Rev. 3, 

 126, 1914; Pr. Am. Acad. 51, 55, 1915; 51, 581, 1916; 52, 57, 1916; 52, 91, 1916. The results 

 for water are given in the following table. 



TABLE 217. — Effect of Pressure on the Freezing Point of Water (Bridgman*). 



P. W. Bridgman, Proc. Am. Acad. 47, pp. 441-558, 1912. 

 t I atm. = 1 . 033 kg/sq. cm. 



TABLE 218. — Effect of Pressure on Boiling Point. * 



Metal. 



Bi 

 Bi 

 Bi 

 Bi 

 Bi 

 Ag 



Pressure. 



10. 2 cm Hg. 

 25.7 cmHg. 

 6.3 atme. 

 II. 7 atme. 

 16.5 atme. 

 10.3 cm Hg. 



Pressure. 



26.3 cm Hg. 



10.0 cm Hg. 

 25.7 cmHg. 



10. 1 cm Hg. 

 26. 2 cm Hg. 

 10.5 cm Hg. 



Pressure. 



20.6 cm Hg. 

 6.3 atme. 

 II. 7 atme. 

 II. 7 atme. 

 21.5 atme. 

 53 . o atme. 



1410 

 1870 

 2100 

 1230 

 1280 

 1510 



* Greenwood, Pr. Roy. Soc, p. 483, 1910, 



Smithsonian Tables. 



