jr 



/y ü '10 /ro /fi-a 'i/y /fo i jo ji^o 

 T 



or 



dv <^ip , ■ ■ III 



So u'heii -7-, = O, ~-, >»'^« il- positive value. In the iriaximuni of 

 dT dT 



tlie vapour tension curve we have : 



dp dv V 

 — - =: hence -— - =: — . 



dT dT T 



