[ 411 ] 



''^"' , 2? "" %J»»'*«K of Molecular Vortices or Cnirl 

 fugal Tkeory ofBU.U.ciUjaui iu Coune.io. S L Xo' 



tHfii^iiy^^itr^c''^^'"^^ "'^»'«' ^■•^' 



[Concluded from p. 363.] 



Section %^co^i,.,—Relatiom between Heat and Expansive 

 Power. 



(9.) V^^if^mofS^siUe and Latent Heat: Funda^nental 



tnX orbTt""-'? ^'T"^' ^^'^^^^^ ^^ ^ valtn of It 

 tion of H?<^ ^ a vanatiou oi temperature, an increase or dnuinu- 



tue body, wi I take place in virtue of that change of the paths of 

 T:V.^J^^t'^ ''-' -' contracted^andadirr: 



tit J'nf 1;^^ ^'^P^'^f ^t' ^^^l^ea positive, the indefinitely small quan- 

 tity of heat which must be communicated to unit/of wei<?ht of 



from f in'oir' t"'"^ T^^^^T '""I ^^^^^^ ^-^^ be abSracted 

 teZeitnl^ to produce the indefinitely small variation of 

 tempeiature Sr simultaneously with the indefinitely small varia- 

 tion of volume 8Y. Let S . Q be divided into two parts 



of which gQ, being directly employed in varying the velocitv of 



he particles, is the variation of the actual or .."««-w/h at pos 



sessed by the body; while 3Q', being employed in varying the r 



heat wi7'""''*^' '"''^'^*/^ '^' "^^'-' transforfnatlon" 

 heat w th expansive power and molecular action, or the variation 

 of what IS called the latent heat; that is to say of a molecular 



The variation of sensible heat has evidently this value, 



^^=^^r (22) 



Let Sjv, 8!/,Sz be the displacements of the orbit of the nar- 

 tides of atomic atmosphere at the point {x, y,.-). A molecule 

 pdxd,jdz IS acted upon by the accelerative forces (see equation 3A) 



'<■' -^<^ -<; 



parallel to the three axes respectively. 



An2VT "i^^'" "''"^r"' °^*^'"'' ^"'''"^ °" *b^ molecule/,^ dy dz 

 during the change of temperature and volume, is ^ J"^ 



2E2 



