Thermodynamic Properties of Air. 35 



is the experimental result of Wullner. that the ratio h increases 

 slightly with decreasing temperature' (from 1*40289 at + 100° 

 to 1*40526 at 0°, for air of ordinary density). An increase of 



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this kind is also shown by the curves of fig. 6. But, more- 

 over, it follows, that with decreasing temperature k reaches 

 a maximum value, which is followed by an abrupt fall. At 

 all densities for which k has been calculated the maximum of 



D2 



