84 



Prof. H. L. Callendar on the Thermodynamical 



Table IX. 

 Values of Constants assumed for Monatomic Gases. 



Gas 

 employed. 



c Q . 

 c. c. 



c. c. 



c -b. 



c. c. 



B 

 xlO" 6 . 



s 



xlO- 6 . 



Factor c ^ /E. 



76 cms. 



100 cms. 



Krypton . . . 



1-64 



0-77 



0-87 



1064 



266 



1-567 



2063 



Argon 



2-18 



1-39 



0-79 



2-175 



5-43 



1016 



1-337 



Helium ... 



5-5 



5-5 



o-oo 



20-8 



52-0 



0-268 



0352 



Assuming the value rc = 0'5, c = c o (0 o /0) o "°, c — c^O'1445 c , 

 we have the following formulae for the zero correction : — 



Zero Correction, Constant-Pressure, 



# -T = (c -b + 2-73 x -1445 x c )po/B, f 



„ „ Constant- Volume, 



6> -T = 3'73 x -1445 x c oPo /R, 



from which we deduce the values of the expansion- and 

 pressure-coefficients given in the following table, assuming 

 the value O = 273°'1O :— 



Table X. 

 Expansion- and Pressure-Coefficients for Monatomic Grases. 



Gas 

 employed. 



1 

 Constant-Pressure, 76 cms. j 



Constant-Volume, % 



= 100 cms. 



0o-T o - 



T 



1/T . 



a T 



T 



1/T . 

 •0036761 



Krypton . . . 



1-52 



J 271-65 



•0036812 



O 

 I AH 



27^-00 



Argon 



0-77 



272-33 



•0036717 



0-72 



272-38 



■0036710 



i Helium 



0-10 



27300 



•0036628 



0-19 



272-91 



■0036640 



The value of the pressure-coefficient observed by Travers 

 (Proc. It. S. lxx. p. 485) for helium at a mean initial 

 pressure of 60 cms. is from '0036624 to '0036631, mean 

 "0036627. The calculated value at this pressure would be 

 '0036632, which is within the limits of possible error, but 

 may indicate that the value of e assumed is too large. 



