396 



The equation of state (32) with the constants there given does not 

 hold very far beyond 100° C, so that values of the saturation specific 

 heats cannot be computed in the range 100° C. — 125° C, until 

 further experimental data are available. 



The following empirical equation was set up by the writer to repre- 

 sent Vi as a function of 6, 



vi = 338.990 - 1 72. 7327 + 46. 2976 02 _ 7 (5262 03 4.0.73653^ 



- . 03541 7 05 + . 0005278 0« (34) 



This equation readily yields the values of • — ,^° required by Equa- 

 tion 27. The following table gives ( — — ) in ccs./gm. -degrees, for 



each 10° C. as computed from Equation 34. 



20 The quantities-^ and — ^ are here replaced by the differential coefficients 



~- and -7-, the error introduced being neghgible. 

 dd du 



