LUMINOSITY OF FLAMES CONTAINING SALT YAPOUES. 
85 
The last column contains numbers given by the equation 10 i k = 
c 2 — 1 
(3'5 + 217c). 
The following table gives the percentage of the salt molecules ionised when 1c is 
very small so that c — 1. These numbers were calculated by means of the equation 
putting c = 1. 
n _ b 
S b + ac ' 
Salt. 
o 
o 
T— H 
X 
NaCl 
1-6 
Na,CO s 
1-6 
KC1 
58-0 
K 0 CO 3 
58-0 
EbCl 
69-0 
CsCl 
90-9 
The ionization is not complete when the concentration of the salt vapour is very 
small because of the finite number of flame ions present with which the salt ions can 
recombine. 
o JO ZO 30 40 JO 60 
7 
70 so op wo 
C - JC 
The equation 10 4 & = -- (b + ac ) shows that ^ C is a linear function of c. Fig. 7 
c ' ' c* — 1 
shows graphically the relation between the experimental values of 
10 4 £c 
c 2 — 1 
and c for 
