THE FLOW OF GASES. 181 



Proceeding now to the other extreme, and assuming 

 that the temperature, after undergoing some diminution, 

 remains constant, we have 



dp _Q. 



or, integrating, 



loo- ^ =Yt 



from which, taking the last three experiments in Table II., 



p. K. V„. V„^'. 



Pi 

 4 "95 I022 650 



3 -98 



In these it appears that the values of K are approxi- 

 mating to the value "825 ; but the great differences show 

 that the temperature effect is far from having become 

 steady, and are quite sufficient to explain the discre- 

 pancies in the actual values of K. There is thus no 

 reason to doubt but that -825 is about the real value of 

 the coefficient of contraction for the orifice, and that the 

 experimental results are quantitatively in accordance with 

 the theory. 



Pipe No. I. — Water (see fig. 2 a, page 170). 



^3= y^ff 



Pipe No. 2. — Gas. 



