1 64 



Table 159. 



VISCOSITY OF GASES AND VAPORS. 

 The values of ju given in the table are lo* times the coefficients of viscosity in C. G. S. units. 



Substance. 



Acetone. 

 Air* 



Alcohol, Methyl 



Alcohol, Ethyl 



Alcohol, Propyl 



norm 



Alcohol, Isopropyl. . 

 Alcohol, Butyl,norm. 

 Alcohol, Isobutyl. . . 

 Alcohol, Tert. butyl. 

 Ammonia 



Argon. 



BenEcne 



Carbon bisulphide . 

 Carbon dioxide 



Carbon monoxide. 



Chlorine 



Chloroform 



Ether. 



Substance. 



Ether 



Ethyl chloride. . 

 Ethyl iodide. . . 



Ethylene 



Helium 



^i 

 n 



Hydrogen 



i( 



a 

 11 



Krypton 



Mercury 



(I 



Methane 



Methyl chloride 



(( a 



It li 



Methyl iodide. . 

 Nitrogen 



(( 



Nitric oxide. . . 

 Nitrous oxide. . 

 Oxygen 



Water Vapor. . . 



Xenon 



Refer- 

 ence. 



I 

 I 

 4 

 3 



2 



5 

 5 

 5 

 5 

 2 



10 

 2 

 2 

 2 

 2 



II 



4 

 2 

 2 

 2 

 3 

 7 

 10 



7 

 7 



10 

 10 

 10 

 7 

 7 

 I 

 I 



9 

 II 



1 Puluj, Wien. Ber. 69 (2), 1874. 



2 Breitenbach, Ann. Phys. 5, 1901. 



3 Steudel, Wied. Ann. 16, 1882. 



4 Graham, Philos. Trans. Lond. 1846, IH. 



5 Schult2«, Ann. Phys. (4), 5, 6, 1901. 



6 Schimiann, Wied. Ann. 23, 1884. 



7 Obermayer, Wien. Ber. 71 (2a), 1875. 



8 Koch, Wied. Ann. 14, 1881, 19, 1883. 



9 Meyer-Schumann, Wied. Ann. 13, 1881 



10 Jeans, assumed mean, 1916. 



11 Rankine, 1910. 



12 Vogel (Eucken, Phys. Z. 14, 1913). For 



summaries see: Fisher, Phys. Rev. 24 

 1904; Chapman, Phil. Tr. A. 211, 

 1911; Gilchrist, Phys. Rev. i, 1913. 

 Schmidt, Ann. d. Phys. 30, 1909. 



* Gilchrist's value of the viscosity of air may be taken as the most accurate at present avail- 

 able. His value at 20.2° C is 1.812 x io~*. The temperature variation given by Holman (Phil. 

 Mag. 1886) gives fx = 1715.50 x io~'(i -f .00275^ - .00000034/"). See Phys. Rev. i, 1913. 

 Millikan (Ann. Phys. 41, 759, 1913) gives for the most accurate value fit = 0.00018240 - 

 0.000000493(23-0 when (23>/>i2) whence jujo = 0.0001809 * o.i %. For /Uo he gives 

 0.0001711. 



fThe values here given were calculated from Koch's table (Wied. Ann. 19, p. 869, 1883) 

 by the formula ju = 489 £1 + 7^6{t — 270)]. 



Smithsonian Tables. 



