22 



From e(|nali()ii (13) ol' Siipjil. N". 33 with (M|ii;ui(>n (I8rz) of Siippl. 

 N". 30r/ it follows thai 



,_ 3 P MjtVIs 



'' ~ 5M' ^ V^AV ^ ^ 



From these formulae follows for the entrop}- constant 



With the valnes iV — B.SS.IO'-^'' (according to Pkrrin), y;;=:1.21.1()^^% 



— =:r4.8().10 •', which were accepted in Suppl. N". 3(k, equation 



k 



(4) with Jik =: R passes into 



Cs — Ji\^\üM—7A^\ (5a) 



If we take Millikan's ^) valnes 1^=^.00.10'', k = LSI . 10^'\ 



- =4.83.10 ", we find 



C, = R —In if — 7.285 



(56) 



For the chemical constant Cne, which is derived from C, by 

 means of the relation ^) 



Cs — 2.bR + Rln Nk 



Cnk = 



i?ln 10 



we find 



(7>^E = YlogJ/ + 3.60i {Qa) 



and / ill c.g.s. units 



Cne = ^ loo- i/ + 3.(57) (66) 



respectively. 



These values ditfer from those which Sackuk has compared with 

 the vapour pressures of mercury and argon aiul which he found 

 fairly well conlirmed, oidy by 0.35 and 0.28 respectively. This 

 agreement may be called very satisfactory considering the uncertainty 

 which yet exists with regard to several of the quantities used in 

 that comparison on the one hand, and the approximate character of 

 some of the hypotheses on which the deduction of the expression 

 for the entropy was fonnded on the other hand. 



1) R. A. MiLLiKAN, Physik. ZS. 14 (1913), p. 796. 

 2^ Cf. 0. Sagkur, Ann. d. Phys. (4) 40 (1913), p. 79, 



