176 



ATOMS, IONS, SALTS, AND SURFACES 



Fig. 23. — The values of — for the curves in this figure, beginning with the bottom curve, are: 

 29.5, 40.2, SQ.i, and 78.5. 



A = Area 



A= I Angstrom unit of length = io~^ cm. 

 A^= I Angstrom unit of area = 10-'*' cm.^ 

 0= Activity 

 a = Activity coefficient 



c = Concentration (respectively, the velocity of light = 2.9986X10'° cm./sec. 

 8 = Partial differential 

 D = D ielectric constant 

 E = Energy 



@ = Electromotive force 



e = Charge on the electron=4.774Xio~"' electrostatic units 

 e = Epsilon, base of Naperian or natural logarithms 

 f = Zeta, fictitious electrical potential at a phase boundary 

 /^ = Force (respectively, a correction factor of multiplication) 

 S = I Faraday — 96,500 coulombs 

 AF = Increase of free energy (zeta function of Gibbs) 

 g= Acceleration of gravity ( = 980.278 cm./sec.^ at the University of Chicago) 

 /? = Heat function for unit area of surface (total surface energy, respectively, for the 



area occupied by i mol); quantum constant ^ = 6.554 erg. sec. 

 K = A constant 



^ = Gas constant per molecule (Boltzmann) =1.372X10-'* ergs per degree per molecule 

 1 = Latent heat of the surface per unit area 

 X = Lambda, latent heat of vaporization per molecule 



