

THE DYNAMICAL THEORY OF OASES. 



Viscosity of a Mixture of GOKS. 



In a complete mixture of gases, in which there is no diffusion going on, 

 tin- velocity at any point is the same for all the gases. 



dv dw\ TT 



.>.|iiiition (122) becomes 



Similarly, 

 p, U- - 





, ...... (139). 



, + 3 M^pfr -k(3A t - 2A t ) 



where p and q refer to the mixture, we 



Since p=pi+p, and 

 shall have 



where ft is the coefficient of viscosity of the mixture. 



If we put *, and *, for the specific gravities of the two gases, referred 

 to a standard gas, in which the values of p and p at temperature 0, and p t 

 and p., 



' 



where /t is the coefficient of viscosity of the mixture, and 



*!+*, 



(141). 



This expression is reduced to /*, when p, = 0, and to /a,, when ^, = 0. For 

 other values of p, and p, we require to know the value of k, the coefficient 





