THERMAL PROPERTIES OF AMMONIA a3 



Properties of Superheated Ammonia. The characteristic equation 

 for si i ted ammonia was given the form 



*-*-* 



and tin- fallowing cnn^t.miH were chosen: 



5- 0.6321 (/> in lb. per sq. i; 

 log m 12.90000 

 r- o.io 

 - 5 



\\'ith these constants the equation represents satisfactorily the experi- 

 iii' -i it al volumes of the superheated vapor, and at saturation it gives 



valuta that a^n-r cloM-ly with \alu > <>l : lt .iin- - ! fan ''< ( bp -i 



kxt 

 With the analytical methods that were used in the case of super* 



lu-ati-il strain the lullouin.^ c< jii.tti. n- .ir- <1< n\<l 



y ..., 



s - 



The constants must be adjusted to meet two conditions, i. Values 

 of c, calculated from the first equation should agree with available ex- 

 perimental values. 2. Values of i' obtained from the equation for i 

 (by subtraction of r from i") should agree with the cxiK-rinu-ntal values 

 found by Dieterici and Drewes. The following values were finally 



chosen 



0-0.382 !- 358.0 



0- 0.000174 *-- 0.8266 



