936 
TABLES 
Dielectric constant for ammonia. 
18.4 | 1.00730 0.934 1.00070 ‘0.00707 2.06 
CN 2? ogee 70 | 681 | 1.99 
59.4 547 814 | are, 501 | 1.98 
62.1 538 808 61 | 501 1.98 
83.8 482 St PAT 57 | 562 | 2.005 
95.3 453 138 | 55 | 543 2.00 
108.4 44 | 707 | 53 | Re 
mean: 2.01 SE 
Dielectric constant for water vapour. 
140.0 | 1.00765 | 0.645 1.00033 0.01155 4.1 
142.2 761 | > 641 BE Ui 1145 4.75 
143.2 736 | 640 | 33 | 110.2 4.6 
145.8 694 636 32 104 4.4 
148.6 648 | _ 632 Be" «| 0975 | 4.1 
mean: 4.5 
moment of the water molecule m, = 2,3 10-18 e.s. units, and for 
ammonia mr Lo 10-1Ses units 
The order of magnitude is the same as the electric moment 
calculated from the equation of state. The numerical correspondence, 
however, still leaves something to be desired. This is not surprising, 
calculation that the density of the liquid remained constant. His formula runs 
e—l a _dam,N dar > Ne 
step rn BE 3 to 
in which for the calculation g = go was assumed. If the necessary correction is 
introduced for the density, a becomes negative for water, so that no real value is 
found for the electric moment. So that in fact, like BoausLawsKr (Phys. Zeitschr. 
1914 p. 283) I could not find any agreement between theory and experiment for 
liquid water. : 
el * 
The form : 
e +2 
greater than 1. If, as in water, « varies between 60 and 80, this fraction varies 
very little with changing «. : 
T=a+1T 
also, is not a very suitable one as soon as « becomes much 
