NOTATION 



The symbols given below are used throughout the preliminary dis- 

 cussion of the properties of vapors, and in the tables. In the selection 

 mbols th< i.. II.. -A ing principles have been observed. I. The pre- 

 vailing usage of reci-nt uiit. i <>n thermodynamics, for example, Bryan 

 and Planck, has been followed. 2. In the case of magnitudes proper- 

 .1 to tin- mass of the mr<liurn under consideration, as volume, entropy, 

 .;>, small (lower case) letters are used to represent the value per uni* 

 3. The- li|uil -t.it.- is characterized by a symbol with a prime, 

 and the state of saturated vapor by a double prime. Thus s' and u 

 denote respectively tin < -ntn >;>y and energy of thr liquid, 5" and ", the 

 same properties of the saturated vapor. 



J - mechanical equivalent of heat 



A - -, reciprocal of mechanical equivalent 



/ - temperature on F. or C. scale 



T absolutr lem|xTature 



p - pressure 



r- volume of unit weight (i Ib.) of fluid 



y - - weight of unit volume 

 v 



c, specific heat at constant volume 

 c, - specific heat at constant pressure 



u - intrinsic energy PIT unit weight 



9 heat absorbed by fluid PIT unit weight 

 q' - heat of liquid 

 q" = total heat of saturated steam 



t - heat content - u + Apv 



r - latent heat of vaporization 



p - r - * - internal latent heat 



+ - Ap (v" - r') - external latent heat 



5 - entropy 



M - Joule-Thomson coefficient 





