THE THERMAL PROPERTIES OF STEAM 

 EXPERIMENTAL DETERMINATIONS OF LATENT HEAT 



Diettrici 

 Griffiths. 



Smith.. 



9*194 



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 054-1 



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1043 

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86.1 

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 14*7 



191.7 



In Fig. 7 these results are shown by the plotted points and the curve 



rrpivsrnts tin- variation of r .i.o.nim^ t., equation I> I:.. ..:.- 



innit jx x tl ti -factory, though Smith's jxiints would indicate that the 

 calculated values may be slightly low. 



FIG. 7. LATENT HEAT or SATumATmo STEAM. 



F. 



Special interest attaches to the value of r at 2I2F. For years 

 Regnault's number 966 B.t.u. was universally accepted. Callendar in 

 n)00 paper gave the value 972, which is almost precisely the \ aim- 

 that is now considered most probable. Davis made use of the experi- 

 ments of Henning and Joly at 212 and set the value of r at 9704 

 B.t.u. Smith's recent experiments * on slow vaporization of water under 

 atmospheric pressure indicate a value higher than any yet 

 Heck uses the value 971.2, M oilier uses 971.4. The present 



Physical Review, Vol. 33, p. 183 (1911). 



