MOLECULAR VOLUME 



It follows that the relation 



671 



2V a 



= const. 



holds at various equal pressures for all normal substances. In 

 the following cases 100 volumes become on combination : 



Table illustrating the Law of Coincident States among the Complex 



Paraffins near the M.P. 



(From Krafft's observations, Ber. 15, 1687.) 

 Under the above conditions the molecular volumes are equal 

 multiples of the molecular volumes at the melting point. 



(c) It is possible to go a step farther, and to trace the Law of 

 Corresponding States into the solid state. The data which 

 furnish evidence for this are due to Vincentini and Omodei 

 {Beibl. 12, 178), and are from observations on certain Pb-Sn 

 alloys. The compounds were examined in the solid state from 

 20 C. up to the melting point (182 C. approx.), and in the liquid 

 state up to 356 C. As in the previous case, the conditions for 

 comparison are met with at equal intervals of temperature above 

 and below the respective melting points. 



Comparison of the Volumes of certain Pb-Sn Alloys under 



Various Conditions. 



